List of longest tunnels

This list of longest tunnels ranks tunnels that are at least 13 km (8.1 mi) long. Only continuous tunnels are included. Pipelines, even those that are buried, are excluded. The longest tunnels have been constructed for water distribution, followed by tunnels for railways.

The southwest portal of the Lærdal Tunnel in Norway, the world's longest road tunnel

World's longest tunnels (in use)
Type Name Location Length Year Comment
Water supply Delaware Aqueduct United States New York State, United States 137,000 m (85.1 mi) 1945 4.1 m in diameter (13.2 m2). New York City's main water supply tunnel.
Water supply Päijänne Water Tunnel Finland Southern Finland, Finland 120,000 m (74.6 mi) 1982 16 m2 cross section. Main water supply tunnel for southern Finland, including Helsinki, drilled through solid rock.
Water supply Dahuofang Water Tunnel China Liaoning, China 85,320 m (53.0 mi) 2009 8 m in diameter[1] (50m2 cross section)
Water supply Orange–Fish River Tunnel South Africa South Africa 82,800 m (51.4 mi) 1972 Longest continuous enclosed aqueduct in the Southern Hemisphere (22.5 m2 cross section). Built to divert water from the Orange River to the Great Fish River.
Water supply Bolmen Water Tunnel Sweden Kronoberg/Scania, Sweden 82,000 m (51.0 mi) 1987 8 m2 cross section
Metro Moscow Metro Bolshaya Koltsevaya line Russia Moscow, Russia 71,000 m (44.1 mi)[2] 2023
(2018–2021 partial completion)		 Circular line, longest metro/rapid transit tunnel
Metro Chengdu Metro Line 6 China Chengdu, China 68,223 m (42.4 mi) 2020 Second longest metro/rapid transit tunnel
Hydroelectric Neelum–Jhelum Hydropower Tunnel Pakistan Muzaffarabad, Azad Kashmir, Pakistan 68,000 m (42.3 mi) 2017 Part of the 969 MW Neelum–Jhelum Hydropower Plant
Wastewater Tunel Emisor Oriente Mexico Mexico City, Mexico 62,500 m (38.8 mi) 2019[3] 7 m in diameter. Longest wastewater tunnel.
Metro Guangzhou Metro Line 18 China Guangzhou, China 58,300 m (36.2 mi) 2021
Metro Guangzhou Metro Line 3 China Guangzhou, China 57,930 m (36.0 mi)
(Excl. branch)		 2005–2018
Railway Twin Tube Gotthard Base Tunnel Switzerland Central Swiss Alps, Switzerland 57,104 m (35.5 mi) and 57,017 m (35.4 mi) 2016 Longest railway tunnel; by geodetic distance (of 55.782 km (34.661 mi)) between the two portals, it was the world's longest transit tunnel. Total 151.84 km (94.35 mi) of broken out tunnels through solid rocks.[4][5] Part of the NRLA.
Metro Beijing Subway Line 10 China Beijing, China 57,100 m (35.5 mi) 2008–2013
Metro Beijing Subway Line 6 China Beijing, China 53,400 m (33.2 mi) 2012–2018
Railway Single Tube Seikan Tunnel Japan Tsugaru Strait, Japan 53,850 m (33.5 mi) 1988 74 m2; longest railway tunnel until 2016. Longest tunnel with an undersea section, running between Honshu and Hokkaido. Undersea section measures 23.3 kilometres (14.5 mi).
Water supply Želivka Water Tunnel[6] Czech Republic Central Bohemian Region, Czech Republic 51,970 m (32.3 mi) 1972 9–12 m2
Metro Seoul Subway: Line 5 South Korea Seoul, South Korea 51,700 m (32.1 mi) 1995–2021 Longest metro/rapid transit tunnel until Guangzhou Metro Line 3 extension opened in 2010, crosses west to east under the Seoul Capital Area.
Dewatering Adit Rothschönberger Stolln[7] Germany Freiberg Mining Field, Germany 50,900 m (31.6 mi) 1844–1882 6 m2 cross section, longest tunnel until 1945. Part of a UNESCO World Heritage Site.
Railway Twin Tube Channel Tunnel United Kingdom France English Channel, United Kingdom/France 50,450 m (31.3 mi) 1994 Second longest railway tunnel until 2016. Longest underwater section, longest international tunnel (2×45 m2 + 1×18 m2), running between Folkestone, Kent, and Coquelles, Pas-de-Calais.
Railway Single Tube Yulhyeon Tunnel South Korea Seoul Capital Area, South Korea 50,300 m (31.3 mi)[8] 2016[9] 107 m2, part of the Suseo high-speed railway.
Water supply River Arpa – Lake Sevan tunnel[10][11] Armenia Armenia (at the time of construction Soviet Union Soviet Union) 48,358 m (30.0 mi)[12] 1981 Longest tunnel built to restore ecological balance. Transfers water from the Arpa to Lake Sevan to recover its level.[13]
Water supply Pahang – Selangor Raw Water Transfer Project[14][15] Malaysia Pahang & Selangor, Malaysia 44,600 m (27.7 mi) 2014 5.2 m in diameter
Metro Wuhan Metro Line 2 China Wuhan, China 44,347 m (27.6 mi) 2012–2019
Water supply #1 Tunnel, Yellow River Diversion to Shanxi North Line China Shanxi, China 43,670 m (27.1 mi) 2011 See South–North Water Transfer Project
Water supply #7 Tunnel, Yellow River Diversion to Shanxi South Line China Shanxi, China 43,500 m (27.0 mi) 2002 See South–North Water Transfer Project
Metro Beijing Subway Line 8 China Beijing, China 42,600 m (26.5 mi) 2012–2021
Metro Shanghai Metro Line 15 China Shanghai, China 42,300 m (26.3 mi) 2021
Metro Chengdu Metro Line 5 China Chengdu, China 42,300 m (26.3 mi) 2019
Metro Beijing Subway Line 14 China Beijing, China 42,000 m (26.1 mi) 2015–2021
Metro Tianjin Metro Line 6 China Tianjin, China 42,000 m (26.1 mi) 2016–2021
Metro Downtown line Singapore MRT, Singapore 41,900 m (26.0 mi)[16][17] 2013–2017 Longest rapid transit line in South East Asia
Metro Nanjing Metro Line 3 China Nanjing, China 41,567 m (25.8 mi) 2011–2015 From Xinghuolu station to Mozhoudonglu station.
Metro Serpukhovsko-Timiryazevskaya Line (Altufyevo – Bulvar Dmitriya Donskogo) Russia Moscow Metro, Russia (construction started at the time of Soviet Union Soviet Union) 41,500 m (25.8 mi) 1983–2002
Metro Suzhou Rail Transit: Line 4 China Suzhou, China 41,500 m (25.8 mi) 2017
Metro Madrid Metro: Line 12 (MetroSur) Spain Madrid, Spain 40,900 m (25.4 mi) 1999–2003
Metro Tocho-mae – Shiodome – Hikarigaoka (Toei Oedo Line) Japan Tokyo, Japan 40,700 m (25.3 mi) 1991–2000 Tokyo Metropolitan Bureau of Transportation
Metro Shanghai Subway: Line 7 China Shanghai, China 40,200 m (25.0 mi) 2009–2011
Hydroelectric Kárahnjúkar Hydropower Plant Iceland Fljótsdalshreppur, Iceland 39,700 m (24.7 mi) 2003–2007 7.2–7.6 meters in diameter (45 m2 cross section). Part of a wider complex of tunnels that are 72 kilometers in length combined.
Water supply Quabbin Aqueduct United States Massachusetts, United States 39,600 m (24.6 mi) 1933
Metro Chengdu Metro Line 4 China Chengdu, China 39,300 m (24.4 mi) 2015–2017
Metro Chengdu Metro Line 7 China Chengdu, China 38,600 m (24.0 mi) 2017
Metro Seoul Subway: Line 3 (Apgujeong–Ogeum) South Korea Seoul, South Korea 38,200 m (23.7 mi) 1985–2010
Metro Kaluzhsko-Rizhskaya Line (Novoyasenevskaya – Medvedkovo) Russia Moscow Metro, Russia (at the time of construction Soviet Union Soviet Union) 37,800 m (23.5 mi) 1958–1990 Longest railway tunnel 1978–1984 and from November 1987 till March 1988; longest metro/rapid transit tunnel 1990–1995
Metro Shenzhen Subway: Luobao Line China Shenzhen, China 37,497 m (23.3 mi) 2009–2011
Metro Chengdu Metro Line 1 China Chengdu, China 37,470 m (23.3 mi)
(Excl. branch)		 2010–2018
Water supply Harold D. Roberts Tunnel[18] United States Colorado, United States 37,464 m (23.3 mi) 1962 Diverts water from the Colorado River watershed to the South Platte River watershed for use in the Denver metropolitan area. Flows across Continental Divide. 4,465 feet (1,361 m) below the surface at its deepest point.
Hydroelectric Shuakhevi Hydropower Plant Georgia (country) Shuakhevi, Adjara, Georgia 37,400 m (23.2 mi) 2013–2017
Metro Istanbul Metro (Line M11) Turkey Istanbul, Turkey 37,200 m (23.1 mi) 2023
Metro Shenzhen Subway: Shekou Line China Shenzhen, China 36,146 m (22.5 mi) 2010–2011
Water supply Dawushan Tunnel, Niulan River Diversion to Dianchi China Yunnan, China 36,137 m (22.5 mi) 2013
Metro Circle line Singapore MRT, Singapore 35,700 m (22.2 mi) 2009–2012
Metro Busan Metro: Line 2 (Dongwon–Jangsan) South Korea Busan, South Korea 35,500 m (22.1 mi) 1999–2009
Railway Songshan Lake Tunnel[19] China Dongguan, China 35,391 m (22.0 mi) 2016 Dongguan–Huizhou intercity railway, longest railway tunnel in China
Metro Seoul Subway: Line 6 South Korea Seoul, South Korea 35,100 m (21.8 mi) 2001
Metro Seoul Subway: Line 7 (Cheongdam–Bupyeong-gu Office) South Korea Seoul, Incheon, Bucheon and Gwangmyeong in South Korea 35,100 m (21.8 mi) 2000–2012
Metro Tianjin Metro: Line 5 China Tianjin, China 34,800 m (21.6 mi) 2018–2021
Railway Single Track Lötschberg Base Tunnel Switzerland Bernese Alps, Switzerland 34,577 m (21.5 mi) 2007 Longest land railway tunnel until Gotthard Base Tunnel was opened; two single track tubes along 12 km, only single track along 22 km. Part of the NRLA.
Metro Istanbul Metro (Line M4) Turkey Istanbul, Turkey 34,050 m (21.2 mi) 2012
Water supply Tyne-Tees Tunnel United Kingdom England, United Kingdom 34,000 m (21.1 mi) 1983 (and earlier) Northumbrian water supply tunnel.
Metro Guangzhou Metro: Line 8 China Guangzhou, China 33,900 m (21.1 mi) 2010–2020
Metro Lyublinsko-Dmitrovskaya Line (Zyablikovo – Seligerskaya) Russia Moscow Metro, Russia (construction started at the time of Soviet Union Soviet Union) 33,400 m (20.8 mi) 1995–2018
Metro Madrid Metro: Line 7 Spain Madrid, Spain 32,919 m (20.5 mi) 1974–2007
Railway Twin Tube New Guanjiao Tunnel China Qinghai, China 32,645 m (20.3 mi) 2014[20] Longest tunnel on the upgraded dual-track Xining–Golmud section of Qinghai–Tibet Railway, longest railway tunnel in China until 2016, 3323.58–3380.97 meters above sea level
Metro Meijo Line – Meikō Line Japan Nagoya Municipal Subway, Japan 32,400 m (20.1 mi) 1965–2004
Metro Guangzhou Metro: Line 2 China Guangzhou, China 32,000 m (19.9 mi) 2010
Metro Rathaus Spandau–Rudow (U7) Germany Berlin U-Bahn, Germany 31,800 m (19.8 mi) 1924–1984
Water supply Gerede Water Transmission Tunnel[21] Turkey Ankara, Turkey 31,592 m (19.6 mi) 2019[22] Longest tunnel in Turkey, 5.2 m in diameter
Metro Seoul Subway: Bundang Line (Seoul Forest–Jukjeon) South Korea Seoul, Seongnam and Yongin in South Korea 31,400 m (19.5 mi) 1994–2012
Metro Daegu Metro: Line 2 South Korea Daegu and Gyeongsan in South Korea 31,400 m (19.5 mi) 2005–2012
Wastewater Milwaukee Metropolitan Sewerage District Deep Tunnel Phase 1 United States Milwaukee County, Wisconsin, United States 31,221 m (19.4 mi) 1993 405 million gallons of combined sewage storage designed to prevent sewage overflow into Lake Michigan. The largest of three phases, totalling 521 million gallons of storage.[23]
Metro Beijing Subway: Line 1 China Beijing, China 31,040 m (19.3 mi) 1971–2000
Metro Bucharest Metro: Line M1 Romania Bucharest, Romania 31,010 m (19.3 mi) 1979–1992 8,670 m, shared with M3 line. Nether less one continuous tunnel.
Metro Côte-Vertu – Montmorency (Line 2 Orange) Canada Montreal Metro, Canada 30,798 m (19.1 mi) 1966–2007
Metro Shanghai Subway: Line 2 China Shanghai, China 30,187 m (18.8 mi) 2000
Metro Parnas – Kupchino (line 2) Russia Saint Petersburg Metro, Russia (construction started at the time of Soviet Union Soviet Union) 30,100 m (18.7 mi) 1961–2006
Metro Guangzhou Metro: Line 5 China Guangzhou, China 29,900 m (18.6 mi) 2009
Water supply Shandaken Tunnel United States Catskill Mountains, New York, United States 29,780 m (18.5 mi) 1924
Metro Shanghai Subway: Line 8 China Shanghai, China 29,650 m (18.4 mi) 2007–2009
Metro Prospekt Veteranov – Devyatkino (line 1) Russia Saint Petersburg Metro, Russia (at the time of construction Soviet Union Soviet Union) 29,600 m (18.4 mi) 1955–1978
Metro Shanghai Subway: Line 10 China Shanghai, China 29,600 m (18.4 mi) 2010
Water supply Evinos – Mornos Tunnel[24][25] Greece Aetolia-Acarnania, Greece 29,400 m (18.3 mi) 1995
Metro Chengdu Metro Line 2 China Chengdu, China 29,000 m (18.0 mi) 2012–2013 Only includes phases 1 and 2
Water supply Hultman Aqueduct[26] United States Eastern Massachusetts, United States 28,640 m (17.8 mi) 1939 11.5 ft (3.5 m) to 14 ft (4.3 m) diameter (15m2 cross section); offline for rehabilitation
Metro Sydney Metro Northwest Australia Sydney, Australia 28,500 m (17.7 mi) 2019 The line incorporates the existing 13 km Epping to Chatswood rail link. It forms part of the wider Sydney Metro project.
Railway Twin Tube Guadarrama Tunnel[27] Spain Sierra de Guadarrama, Spain 28,377 m (17.6 mi) 2007
Water supply MetroWest Water Supply Tunnel[28] United States Eastern Massachusetts, United States 28,300 m (17.6 mi) 2003 14 ft (4.3 m) diameter (15m2 cross section)
Railway Twin Tube West Qinling Tunnel China Gansu, China 28,236 m (17.5 mi) 2016 Chongqing–Lanzhou railway
Metro Taipei Metro: Blue Line Taiwan Taipei, Taiwan 28,200 m (17.5 mi) 1999–2015
Metro Beijing Subway: Line 4 China Beijing, China 28,165 m (17.5 mi) 2009–2010
Metro Seoul Subway: Line 9 (Gimpo Airport–Sports Complex) South Korea Seoul, South Korea 28,100 m (17.5 mi) 2009–2015
Railway Single Tube Taihang Tunnel[29] China Taihang Mountains, China 27,848 m (17.3 mi) 2007 On Shijiazhuang–Taiyuan high-speed railway
Metro Morden–East Finchley (Northern line) United Kingdom London Underground, England, United Kingdom 27,800 m (17.3 mi) 1890–1940 Longest railway tunnel in UK
Metro Shenyang Subway: Line 1 China Shenyang, China 27,800 m (17.3 mi) 2010
Water supply Melamchi Water Tunnel[30] Nepal Melamchi to Kathmandu, Nepal 27,000 m (16.8 mi) 2021[31] See Melamchi Water Supply Project
Metro Seoul Subway: Incheon Line 1 (Bakchon–International Business District) South Korea Incheon, South Korea 27,000 m (16.8 mi) 1999–2009
Metro Dainichi–Nagahara (Tanimachi Line) Japan Osaka Metro, Japan 26,900 m (16.7 mi) 1967–1983
Particle accelerator LEP Tunnel[32] Switzerland France CERN, Switzerland/France 26,659 m (16.6 mi) 1988 (breakthrough) 11.3–15.9 m2 circular ring, now used by Large Hadron Collider
Railway Single Tube Hakkōda Tunnel (Tōhoku Shinkansen) Japan Hakkōda Mountains, Japan 26,455 m (16.4 mi) 2010 64–74 m2
Water supply Şanlıurfa Irrigation Tunnels Turkey Turkey 26,400 m (16.4 mi) 2005[33]
Metro Shanghai Subway: Line 9 China Shanghai, China 26,263 m (16.3 mi) 2007–2010
Hydroelectric Gilgel Gibe II Power Station headrace tunnel Ethiopia Ethiopia 26,000 m (16.2 mi) 2005–2009 Tunnel partially collapsed, was repaired in 2010.[34][35]
Water supply #5 Tunnel, Yellow River Diversion to Shanxi South Line China Shanxi, China 26,000 m (16.2 mi) 2002 See South–North Water Transfer Project
Metro Daegu Metro: Line 1 South Korea Daegu, South Korea 25,900 m (16.1 mi) 1997–2002
Metro MRT Blue Line Thailand Bangkok, Thailand 25,800 m (16.0 mi) 2004 Second phase will be open in April 2019
Railway Single Tube Iwate-Ichinohe Tunnel Japan Ōu Mountains, Japan 25,810 m (16.0 mi) 2002
Water supply Sudbury Aqueduct United States Eastern Massachusetts, United States 25,750 m (16.0 mi) 1878 Emergency backup use
Metro Suzhou Rail Transit: Line 1 China Suzhou, China 25,739 m (16.0 mi) 2007–2011
Metro Line 3 (Athens Metro)[36] Greece Athens, Greece 25,200 m (15.7 mi) 1992–2022 Line 3 is actually 46.5 km long, but only 25.2 km of it are underground.
Metro Helsinki metro (Kivenlahti–Sörnäinen) Finland

Espoo and Helsinki, Finland

 25,200 m (15.7 mi) 1982–2022
Metro Taipei Metro: Orange Line (Huilong – Nanshijiao) Taiwan Taipei, Taiwan 25,100 m (15.6 mi)
(Excl. branch)		 1998–2013
Railway Twin Tube Musil Tunnel[37][38] South Korea Wonju–Jecheon (Jungang Line), South Korea 25,080 m (15.6 mi) 2020[39]
Road Lærdal Tunnel Norway Lærdal – Aurland, Norway 24,510 m (15.2 mi) 2000 The longest road tunnel in the world
Metro Yellow Line (Delhi Metro): GTB Nagar – Qutub Minar[40] India Delhi, India 24,000 m (14.9 mi) 2004–2010 Longest tunnel in India
Metro Madrid Metro: Line 1 Spain Madrid, Spain 23,876 m (14.8 mi) 1919–2007
Railway Lainzer/Wienerwaldtunnel Austria west of Vienna, Austria 23,844 m (14.8 mi) 2012 Breakthrough 2007
Wastewater Harbour Area Treatment Scheme (HATS) Stage 1[41] Hong Kong Hong Kong, China (construction started in British Hong Kong British Hong Kong) 23,600 m (14.7 mi) 2001
Water supply Eucumbene-Snowy Tunnel[42][43] Australia New South Wales, Australia 23,500 m (14.6 mi) 1965 Part of the 145 km tunnel network of the Snowy Mountains Scheme
Railway South Lüliangshan Tunnel[44] China Shanxi, China 23,473 m (14.6 mi) 2014[45] 2 tubes, part of Shanxi–Henan–Shandong railway
Metro Madrid Metro: Line 6 Spain Madrid, Spain 23,472 m (14.6 mi) 1979–2007
Metro Angrignon – Honoré-Beaugrand (Line 1 Green) Canada Montreal Metro, Canada 23,262 m (14.5 mi) 1966–2007
Metro Warsaw Metro Line 1: Kabaty – Młociny Poland Warsaw, Poland 23,100 m (14.4 mi) 1983–2008
Metro Beijing Subway: Line 2 China Beijing, China 23,100 m (14.4 mi) 1969–1987
Hydroelectric Xinma Hydroelectric Power Station Water Tunnel China Sichuan, China 22,975 m (14.3 mi) 2009
Railway Iiyama Tunnel[46] Japan Iiyama, Japan 22,225 m (13.8 mi) 2015
Railway Daishimizu Tunnel Japan Mount Tanigawa, Japan 22,221 m (13.8 mi) 1982 Longest railway tunnel until Seikan Tunnel was opened.
Water supply Eucumbene-Tumut Tunnel[42] Australia New South Wales, Australia 22,200 m (13.8 mi) 1959 Part of the 145 km tunnel network of the Snowy Mountains Scheme
Road WestConnex Australia Sydney, New South Wales, Australia 21,800 m (13.5 mi) 2019–23
Railway Daegwallyeong Tunnel South Korea Pyeongchang–Gangneung (Gyeonggang Line), South Korea 21,755 m (13.5 mi) 2017[47]
Water supply Vorotan–Arpa Tunnel[48] Armenia Armenia (construction started at the time of Soviet Union Soviet Union) 21,652 m (13.5 mi) 2004
Particle accelerator (incomplete) UNK proton accelerator Russia Protvino, Russia (construction started at the time of Soviet Union Soviet Union) 21,000 m (13.0 mi) 1994 (breakthrough) Construction stopped after finishing of main circle tunnel, future is unclear
Metro Guangfo Metro China Foshan, China 20,900 m (13.0 mi) 2010
Railway Twin Tube Luliangshan Tunnel China Shanxi, China 20,785 m (12.9 mi) 2011 2 tubes: left tube is 20785 meters, right tube is 20738 meters
Metro Shanghai Subway: Line 4 China Shanghai, China 20,740 m (12.9 mi) 2005–2007
Metro Barcelona Metro: Line 1 Spain Barcelona, Spain 20,700 m (12.9 mi) 1926–1992
Hydroelectric Ward Tunnel United States California, United States 20,610 m (12.8 mi) 1920–1925 Part of the Big Creek Hydroelectric Project of the Southern California Edison Company. Excavated through solid granite.
Metro Busan Metro: Line 1 (Hadan-Busan Nat'l Univ. of Education) South Korea Busan, South Korea 20,600 m (12.8 mi) 1985–1994
Metro Xian Subway: Line 2 China Xian, China 20,500 m (12.7 mi) 2011
Metro Daejeon Metro: Line 1 South Korea Daejeon, South Korea 20,470 m (12.7 mi) 2006–2007
Metro Nanjing Metro Line 2 China Nanjing, China 20,380 m (12.7 mi) 2010
Metro Shanghai Subway: Line 6 China Shanghai, China 20,336 m (12.6 mi) 2007
Railway Geumjeong Tunnel[49] South Korea Busan, South Korea 20,323 m (12.6 mi) 2010 Gyeongbu high-speed railway
Railway Twin Tube Wushaoling Tunnel China Wuwei, China 20,060 m (12.5 mi) 2006–2007 2 tubes: left tube is 20060 meters, right tube is 20050 meters
Metro Istanbul Metro (Line M5) Turkey Istanbul, Turkey 20,000 m (12.4 mi) 2017–2018 M5 line (Üsküdar-Çekmeköy) is 20 km with depot line. Line is 30.9 km with Çekmeköy-Sultanbeyli Phase.
Electric power transmission tunnel The London Connection[50] United Kingdom London, England, United Kingdom 20,000 m (12.4 mi) 2005[51] National Grid plc, 3-metre diameter, 400 kilovolt circuit
Railway Twin Tube Simplon Tunnel Switzerland Italy Lepontine Alps, Switzerland/Italy 19,803 m (12.3 mi) 1906 Parallel tunnel was opened in 1922 (19,824 m long); longest transit tunnel until Daishimizu Tunnel was opened. Part of the NRLA.
Metro Koltsevaya Line (Circle Line) Russia Moscow Metro, Russia (at the time of construction Soviet Union Soviet Union) 19,400 m (12.1 mi) 1950–1954
Hydroelectric Futang Hydroelectric Power Station Water Tunnel China Sichuan, China 19,319 m (12.0 mi) 2004[52]
Metro Seoul Subway: Bundang Line (Suwon station–Jukjeon station) South Korea Yongin and Suwon in South Korea 19,300 m (12.0 mi) 2007–2013
Railway Single Tube Qamchiq Tunnel[53] Uzbekistan Angren–Pap railway, Uzbekistan 19,200 m (11.9 mi) 2016 Longest non-metro railway tunnel in ex-USSR
Metro North East line Singapore MRT, Singapore 19,200 m (11.9 mi) 2003–2011 World's first fully automated and driverless underground rapid transit line
Metro Suzhou Rail Transit: Line 2 China Suzhou, China 19,146 m (11.9 mi) 2009–2012
Metro Maskoŭskaja Line Belarus Minsk Metro, Belarus (construction started at the time of Soviet Union Soviet Union) 19,100 m (11.9 mi) 1984–2014
Railway Single Track Vereina Switzerland Silvretta, Switzerland 19,058 m (11.8 mi) 1999 Single track with passing loops, metre gauge
Metro Seoul Subway: Line 4 (Ssangmun–Ichon) South Korea Seoul, South Korea 19,000 m (11.8 mi) 1980
Wastewater Harbour Area Treatment Scheme (HATS) Stage 2[54] Hong Kong Hong Kong, China 18,800 m (11.7 mi) 2015
Railway Shin-Kanmon Tunnel Japan Kanmon Straits, Japan 18,713 m (11.6 mi) 1975
Hydroelectric Shiziping Hydroelectric Power Station Water Tunnel China Sichuan, China 18,712 m (11.6 mi) 2010[55]
Railway Single Tube Vaglia Italy Bologna – Firenze, Italy 18,711 m (11.6 mi) 2009 Bologna–Florence high-speed railway
Hydroelectric Baoxing Hydroelectric Power Station Water Tunnel China Sichuan, China 18,676 m (11.6 mi) 2007
Railway Single Tube Apennine Base Tunnel Italy Tuscan-Emilian Apennines, Italy 18,507 m (11.5 mi) 1934
Metro Obolonsko–Teremkivska line Ukraine Kyiv Metro, Ukraine (construction started at the time of Soviet Union Soviet Union) 18,480 m (11.5 mi) 1976–2013
Metro Istanbul Metro (Line M3) Turkey Istanbul, Turkey 18,460 m (11.5 mi) 2013-2022
Railway Twin Tube Qinling Tunnel I-II China Qin Mountains, China 18,460 m (11.5 mi) 2000 2 tubes: left tube is 18460 meters, right tube is 18456 meters[56]
Hydroelectric Tatev Hydroelectric Power Station Water Tunnel Armenia Armenia (at the time of construction Soviet Union Soviet Union) 18,400 m (11.4 mi) 1970
Road Twin Tube Yamate Tunnel Japan Tokyo, Japan

18,200 m (11.3 mi)

 2015
Railway South Taihangshan Tunnel China Shanxi, China 18,125 m (11.3 mi) 2014[57] 2 tubes, part of Shanxi–Henan–Shandong railway
Metro Shanghai Subway: Line 1 China Shanghai, China 18,110 m (11.3 mi) 1995
Metro Avtozavodskaya Line Belarus Minsk Metro, Belarus (construction started at the time of Soviet Union Soviet Union) 18,100 m (11.2 mi) 1990–2005
Road Twin Tube Zhongnanshan Tunnel China Shaanxi, China 18,040 m (11.2 mi) 2007 The longest road tunnel in China
Metro Line 2 (Athens Metro)[36] Greece Athens, Greece 17,900 m (11.1 mi) 1991–2013
Metro Beijing Subway: Line 5 China Beijing, China 17,825 m (11.1 mi) 2007
Metro Ankara Metro (AKM-Koru) Turkey Ankara, Turkey 19,660 m (12.2 mi) 1997–2014 M1 line is tunnel in Kızılay between AKM, M2 line is completely underground.
Road Jingpingshan China Sichuan, China 17,500 m (10.9 mi) 2008 The deepest transportation tunnel in China
Metro Shenzhen Subway: Longgang Line China Shenzhen, China 17,333 m (10.8 mi) 2010–2011
Metro Kholodnohirsko–Zavodska Line Ukraine Kharkiv Metro, Ukraine (at the time of construction Soviet Union Soviet Union) 17,300 m (10.7 mi) 1975–1978
Metro Seoul Subway: Shinbundang Line South Korea Seoul and Seongnam in South Korea 17,300 m (10.7 mi) 2011
Water supply Mavi Tünel (Blue Tunnel)[58] Turkey Konya, Turkey 17,034 m (10.6 mi) 2012 Breakthrough 2007
Road Gotthard Road Tunnel Switzerland Lepontine Alps, Switzerland 16,918 m (10.5 mi) 1980
Metro Guangzhou Metro: Line 4 China Guangzhou, China 16,790 m (10.4 mi) 2005
Metro İzmir Metro Line M1 Turkey İzmir, Turkey 16,750 m (10.4 mi) 2000–2023
Metro Barcelona Metro: Line 4 Spain Barcelona, Spain 16,700 m (10.4 mi) 1929–1999
Metro Seoul Subway: Line 2 (Jamsil–Sillim) South Korea Seoul, South Korea 16,700 m (10.4 mi) 1980–1984
Metro Barcelona Metro: Line 3 Spain Barcelona, Spain 16,600 m (10.3 mi) 1924–2001
Metro Barcelona Metro: Line 5 Spain Barcelona, Spain 16,600 m (10.3 mi) 1959–1983
Water supply Murrumbidgee-Eucumbene Tunnel[42] Australia New South Wales, Australia 16,600 m (10.3 mi) 1961 Part of the 145 km tunnel network of the Snowy Mountains Scheme
Metro Istanbul Metro (Line M2) Turkey Istanbul, Turkey 16,500 m (10.3 mi) 2000–2009
Metro Beijing Subway: Line 9 China Beijing, China 16,500 m (10.3 mi) 2011–2012
Hydroelectric Jinkang Hydroelectric Power Station Water Tunnel China Sichuan, China 16,490 m (10.2 mi) 2006
Metro Madrid Metro: Line 8 Spain Madrid, Spain 16,467 m (10.2 mi) 1998–2007
Metro Guangzhou Metro: Line 1 China Guangzhou, China 16,449 m (10.2 mi) 1997
Metro Madrid Metro: Line 3 Spain Madrid, Spain 16,424 m (10.2 mi) 1939–2007
Railway Rokkō Tunnel[59] Japan Mount Rokkō, Japan 16,250 m (10.1 mi) 1972
Railway Solan Tunnel[60] South Korea Taebaek, Gangwon-do, South Korea 16,240 m (10.1 mi) 2012 Taebaek Line, includes a spiral
Hydroelectric Kemano T1 and T2[61]  CAN Kemano, Canada[62] 16,000 m

(9.9m)

 1954-2022 Twin 16km hydroelectric tunnels. T1 was completed in 1954 and T2 was completed in May, 2022.[63] Both are in operation.
Metro Seoul Subway: Line 7 (Suraksan–Konkuk University) South Korea Seoul, South Korea 16,000 m (9.9 mi) 1996
Railway Münsterertunnel Austria Tyrol, Austria 15,990 m (9.9 mi) 2012 Longest tunnel in Austria.
Railway Xiangshan Tunnel 象山隧道 China Fujian, China 15,917 m (9.9 mi) 2012 2 tubes, part of Longyan–Xiamen Railway
Railway Terfnertunnel Austria Tyrol, Austria 15,840 m (9.8 mi) 2012
Former railway Henderson Tunnel[64][65] United States Front Range, United States 15,800 m (9.8 mi) 1976 Narrow gauge railway, replaced by a conveyor belt in 1999. Only one portal (served an underground mine)[66]
Water supply Pandaoling Tunnel, Datong River Diversion to Shaanxi Project China Shaanxi, China 15,723 m (9.8 mi) 1994
Metro Copenhagen Metro: City Circle Line Denmark Denmark 15,500 m (9.6 mi) 2019 Longest railway tunnel in Denmark and Scandinavia
Metro Budapest Metro: Line 3[67] Hungary Hungary 15,500 m (9.6 mi) 1976–1990 Line 3 is actually 17.39 km long, but only 15.5 km of it is underground.
Railway Single Track Furka Base Switzerland Urner Alps, Switzerland 15,442 m (9.6 mi) 1982 Single track with passing loops, metre gauge
Railway Twin Tube Ceneri Base Tunnel Switzerland Lepontine Alps, Switzerland 15,400 m (9.6 mi) 2020 Part of the NRLA
Metro Seoul Subway: Line 3 (Gupabal–Geumho) South Korea Seoul, South Korea 15,400 m (9.6 mi) 1985
Metro Tianjin Subway: Line 1 China Tianjin, China 15,378 m (9.6 mi) 1976–2006
Railway Haruna Japan Gunma Prefecture, Japan 15,350 m (9.5 mi) 1982
Railway Single Track Severomuysky Tunnel Russia Severomuysky Range, Russia (construction started at the time of Soviet Union Soviet Union) 15,343 m (9.5 mi) 2003
Wastewater Deer Island Outfall Tunnel[68] United States Deer Island, Boston, Massachusetts, United States 15,290 m (9.5 mi) 2000 24 ft (7.3 m) diameter (42m2 cross section); discharges treated effluent into Atlantic Ocean
Railway Single Tube Firenzuola Italy Bologna – Firenze, Italy 15,285 m (9.5 mi) 2009 Bologna–Florence high-speed railway
Hydroelectric Inguri Hydroelectric Power Station Water Tunnel Georgia (country) Georgia (at the time of construction Soviet Union Soviet Union) 15,279 m (9.5 mi) 1978
Metro Shanghai Subway: Line 2 China Shanghai, China 15,274 m (9.5 mi) 2000 Between Zhanjianggaoke station and Lingkong Station
Water supply Jinquidi Tunnel, Niulan River Diversion to Dianchi China Yunnan, China 15,257 m (9.5 mi) 2013
Hydroelectric Baotan Hydroelectric Power Station Water Tunnel China Guangxi, China 15,200 m (9.4 mi) 2010
Railway Gorigamine Tunnel[59] Japan Takasaki – Nagano, Japan 15,175 m (9.4 mi) 1997
Hydroelectric Xuecheng Hydroelectric Power Station Water Tunnel[69] China Sichuan, China 15,174 m (9.4 mi) 2007
Railway Single Track Monte Santomarco Italy Paola – Cosenza, Italy 15,040 m (9.3 mi) 1987
Railway Single Tube Gotthard Rail Tunnel Switzerland Lepontine Alps, Switzerland 15,003 m (9.3 mi) 1882 Longest transit tunnel until Simplon Tunnel was opened.
Metro Gwangju Metro: Line 1 (Sotae station–Dosan station) South Korea Gwangju, South Korea 15,000 m (9.3 mi) 2004
Railway Nakayama Tunnel Japan Gunma Prefecture, Japan 14,857 m (9.2 mi) 1982 Jōetsu Shinkansen
Water supply Dangara Irrigation Tunnel[70] Tajikistan Nurek, Tajikistan (at the time of construction Soviet Union Soviet Union) 14,800 m (9.2 mi) 1987
Railway Cuajone-El Sargento Peru Ilo-Toquepala / Cuajone Industrial Railroad – Southern Peru Copper Corporation, Peru 14,724 m (9.1 mi)[71] 1975
Railway Single Tube Mount Macdonald Tunnel Canada Rogers Pass, Glacier National Park, Canada 14,723 m (9.1 mi) 1989
Railway Single Tube Lötschberg Tunnel Switzerland Bernese Alps, Switzerland 14,612 m (9.1 mi) 1913
Water supply Caoe River Diversion Project China Zhejiang, China 14,600 m (9.1 mi) 2011
Railway Single Tube Romerike Tunnel Norway Oslo – Lillestrøm, Norway 14,580 m (9.1 mi) 1999
Railway Fajiushan Tunnel[72] China Shanxi, China 14,573 m (9.1 mi) 2014 Part of Shanxi–Henan–Shandong railway.
Water supply Snowy-Geehi Tunnel[42] Australia New South Wales, Australia 14,500 m (9.0 mi) 1966 Part of the 145 km tunnel network of the Snowy Mountains Scheme
Metro Seoul Subway: Line 4 (Isu–Beomgye) South Korea Seoul, Gwacheon and Anyang in South Korea 14,500 m (9.0 mi) 1980–1994
Hydroelectric Jisha Hydroelectric Power Station Water Tunnel China Yunnan, China 14,467 m (9.0 mi) 2007
Road Twin tube Ryfylke Tunnel Norway Stavanger–Strand, Norway 14,400 m (8.9 mi) 2019 Longest underwater road tunnel in the world
Water supply #6 Tunnel, Yellow River Diversion to Shanxi South Line China Shanxi, China 14,400 m (8.9 mi) 2002 See South–North Water Transfer Project
Water supply Ala Mountain Pass Water Supply Project China Xinjiang, China 14,346 m (8.9 mi) 2010
Road Twin Tube Mount Ovit Tunnel[73] Turkey Erzurum Province–Rize Province, Turkey 14,346 m (8.9 mi) 2018
Metro Stockholm Metro: Tunnelbana 3 (Blue Line) Kungsträdgården–Hjulsta Sweden Stockholm, Sweden 14,300 m (8.9 mi) 1975–1977
Railway Single Tube Dayaoshan Tunnel[74] China Nanling Mountains, China 14,294 m (8.9 mi) 1987
Hydroelectric Zaramag Hydroelectric Power Station Water Tunnel[75][76] Russia Ardon River, North Ossetia, Russia 14,226 m (8.8 mi) 2015[77]
Water supply Tooma-Tumut Tunnel[42] Australia New South Wales, Australia 14,200 m (8.8 mi) 1961 Part of the 145 km tunnel network of the Snowy Mountains Scheme
Metro Metro Lisbon – Blue (Seagull) Line Portugal Lisbon, Portugal 14,000 m (8.7 mi) 1959–2007
Metro MTR – Island line (West of Heng Fa Chuen) Hong Kong Hong Kong, China (construction started at the time of British Hong Kong British Hong Kong) 14,000 m (8.7 mi) 1985–2014
Road Arlberg Road Tunnel Austria Arlberg, Austria 13,972 m (8.7 mi) 1978
Water supply Shanggongshan Tunnel, Zhangjiuhe Water Supply Project China Yunnan, China 13,941 m (8.7 mi) 2007
Hydroelectric Dayingshan #4 Hydroelectric Power Station Water Tunnel China Yunnan, China 13,932 m (8.7 mi) 2009 8.5 m in diameter (57m2 cross section)
Railway Hokuriku Tunnel Japan Fukui Prefecture, Japan 13,870 m (8.6 mi) 1962 Hokuriku Main Line
Railway Single Tube Xiapu Tunnel China Fujian, China 13,838 m (8.6 mi) 2009
Railway Twin Tube Yesanguan Tunnel China Hubei, China 13,838 m (8.6 mi) 2010 Tube I: 13838 meters, tube II: 13796 meters
Hydroelectric Centrala Hidroelectrică Lotru-Ciunget Romania Ciungetu, Romania 13,719 m (8.5 mi) 1972 5 m in diameter
Railway Single Tube Fréjus (Mont Cenis) France Italy Alps, France/Italy (construction started in the Kingdom of Sardinia) 13,657 m (8.5 mi) 1871 Longest transit tunnel until Gotthard Tunnel was opened.
Road Twin Tube Xishan Tunnel China Shanxi, China 13,654 m (8.5 mi) 2012 Left tube: 13654 meters, right tube: 13570 meters
Railway Single Tube North Tianshan Tunnel China Xinjiang, China 13,610 m (8.5 mi) 2009
Railway Marmaray Turkey Istanbul, Turkey 13,600 m (8.5 mi) 2013 Built next to a fault zone, between two continents
Railway Single Track Savio Rail Tunnel Finland Helsinki – Kerava, Finland 13,575 m (8.4 mi) 2008
Metro Busan Metro: Line 3 (Suyeong–Deokcheon) South Korea Busan, South Korea 13,500 m (8.4 mi) 2005
Railway Twin Tube Shin Shimizu Tunnel[59] Japan Mount Tanigawa, Japan 13,500 m (8.4 mi) 1967
Road Mount Erlang Tunnel China Sichuan, China 13,433 m (8.3 mi) 2018 Erlangshan extra-long tunnel part of Yakang Expressway
Railway Single Track Hex River Tunnel[78] South Africa Hex River Pass, South Africa 13,400 m (8.3 mi) 1989
Railway Wonhyo Tunnel[79][80] South Korea Ulsan, South Korea 13,270 m (8.2 mi) 2010 Gyeongbu high-speed railway
Railway Single Tube Dabieshan Tunnel China Hubei, China 13,256 m (8.2 mi) 2008
Railway Schlern Tunnel[81] Italy South Tyrol, Italy 13,159 m (8.2 mi) 1993
Railway Single Tube Caponero-Capoverde Italy Genova – Ventimiglia, Italy 13,135 m (8.2 mi) 2001 Includes an underground station ("San Remo")
Road Twin Tube Hongtiguan Tunnel China Shanxi, China 13,122 m (8.2 mi) 2013 Left tube: 13122 meters, right tube: 13098 meters
Metro Barcelona Metro Line 2 Spain Barcelona, Spain 13,100 m (8.1 mi) 1985–1997
Railway Aki Tunnel Japan San'yō Shinkansen, Japan 13,030 m (8.1 mi) 1975
Many more tunnels exist that are shorter than 13 kilometres (8 mi)

World's longest tunnels (under construction)
Type Name Location Length Year Comment
Water Supply Central Yunnan Water Diversion Project China Yunnan, China 661,000 m (410.7 mi) (??) Inter river basin water transfer[82][83]
Water Supply Kashuang Water Tunnel China Xinjiang, China 280,000 m (174.0 mi) (??) Water transfer from the snow melt of Altai Mountains to the arid region of Xinjiang[84]
Water Supply New York City Water Tunnel No. 3 United States New York State, United States 96,560 m (60.0 mi) 2026[85] More water supply for New York City. Already in use; at completion it may be the world's third longest tunnel
Metro Paris Métro Line 15 France Paris/Île-de-France, France 75,000 m (46.6 mi) 2025–2030 Circular line; will form the longest subway tunnel.
Railway Twin Tube Mont d'Ambin Base Tunnel France Italy Cottian Alps, France/Italy 57,500 m (35.7 mi) 2032[86] Part of the Lyon–Turin high-speed railway. Reconnaissance tunnels under construction since 2002; construction of main tunnel started in 2016.[87]
Railway Twin Tube Brenner Base Tunnel Austria Italy Stubai Alps, Austria/Italy 55,000 m (34.2 mi) 2028[88] Construction started in March 2015. Together with the already constructed Inntal Tunnel it will form the world's longest continuous railway tunnel with 64 km.[89][90]
Metro Thomson-East Coast Line Singapore MRT, Singapore 43,000 m (26.7 mi) 2024 Excluding planned extension
Railway Yigong tunnel China Tibet, China 42,500 m (26.4 mi) 2030 Part of the Sichuan–Tibet railway. Construction started in November 2020.[91]
Railway Sejila tunnel China Tibet, China 37,900 m (23.5 mi) 2030 Part of the Sichuan–Tibet railway. Construction started in November 2020.[92]
Mineral transportation Woodsmith Mine Tunnel Potash Project Mineral Transport System (MTS) United Kingdom North York Moors, United Kingdom 36,700 m (22.8 mi)[93] 2022[94] 6 m in diameter[95] incorporating conveyor and maintenance access. Start of construction was planned for 2016, but actually started in April 2019.[96][97]
Railway Gaoligongshan Tunnel China Yunnan, China 34,586 m (21.5 mi) 2022 Railway between Dali and Ruili. Construction started in August 2017.[98]
Metro L9 Spain Barcelona, Spain 33 km (20.5 mi) (??)
(2009–2016 partial completion)		 Excluding branches. Northern section of the line is in operation since 2009-12-13. Southern section of the line is in operation since 2016-02-12. Future of central section is unclear.
Railway Twin Tube Koralm Tunnel Austria Koralpe, Austria 32,900 m (20.4 mi) 2026[99] Part of the Koralm Railway; boring of main tunnel started at the west portal in May 2010.[100]
Water Supply NCP Canal Main Tunnel Sri Lanka Anuradhapura East, Sri Lanka 27,800 m (17.3 mi) 2025 Part of North Central Province Canal under Mahaweli Development programme. Low slope tunnel with gravity flow, 8m in diameter. Supplies water from Moragahakanda Reservoir to North Central and Northern Provinces.[101]
Railway Twin Tube Semmering Base Tunnel Austria Lower Austria/Styria, Austria 27,300 m (17.0 mi) 2028[102] Construction of the first contract section started in January 2014.[103] Will cut travel time between Vienna and Graz by 30 minutes and is part of the Baltic–Adriatic Corridor
Road Rogfast tunnel Norway Randaberg–Kvitsøy–Bokn, Norway 26,700 m (16.6 mi) 2031[104] Construction started in January 2018, halted October 2019 due to expected cost overruns, revised plan and 48% cost increase approved November 2020; construction to restart late 2021.[104][105] Will be the longest road tunnel in the world, and also the deepest undersea tunnel, 392 metres (1,286 ft) below sea level.
Metro Suburban Rail Loop East Australia Melbourne, Victoria, Australia 26,000 m (16 mi)[lower-alpha 1] 2035[106] Construction started in June 2022.[107] SRL North is still under early planning, projected to be completed by 2053.
Water Supply Mae Taeng–Mae Ngat Tunnel[108] Thailand Chiang Mai, Thailand 25,624 m (15.9 mi) 2021 4 m in diameter. This tunnel is a part of "Mae Taeng–Mae Ngat–Mae Kuang Diversion Tunnel Project"
Railway Twin Tube Pajares Base Tunnel Spain Asturias/León, Spain 24,667 m (15.3 mi) 2023 Breakthrough 2008; opening date in question due to severe water leakage and lowering of local water tables[109]
Metro Metro Manila Subway Philippines Metro Manila, Philippines 23,160 m (14.4 mi) 2028 Only for the dedicated mainline between East Valenzuela and FTI.[110] To be partially opened in 2025.[111]
Water Supply Mae Ngat–Mae Kuang Tunnel[108] Thailand Chiang Mai, Thailand 22,975 m (14.3 mi) 2021 4.2 m in diameter. This tunnel is a part of "Mae Taeng–Mae Ngat–Mae Kuang Diversion Tunnel Project"
Road Twin Tube Sengli Daban Tunnel China Xinjiang, China 22,035 m (13.7 mi) 2026[112] Construction started in 2020. It bypasses Sengli Daban mountain pass which sits up at 4091 meters above the sea level. Once completed, it will become the longest road tunnel in the world at an altitude of over 4000m.
Railway Follo Line Norway Oslo, Norway 19,500 m (12.1 mi) 2022[113] Groundbreaking 2014[114]
Road WestConnex Australia Sydney, Australia 19,000 m (11.8 mi) 2023
(2019–2020 partial completion)		 New M4 Tunnels opened 2019, WestConnex M8 opened 2020
Railway twin tube Bentong Tunnel

(Genting Tunnel)

 Malaysia Bentong, Pahang, Malaysia 18,000 m (11.2 mi) 2027 Part of MRL East Coast Rail Link project.

Will became the longest tunnel in South East Asia[115]

Road and railway Fehmarn Belt Fixed Link Germany Denmark Fehmarn Belt, Germany/Denmark 17,600 m (10.9 mi) 2029[116] Construction started in January 2021[117]
Road Förbifart Stockholm[118] Sweden Stockholm, Sweden 16,500 m (10.3 mi) 2030[119] Construction started in August 2014
Railway Zhoushan underwater tunnel China Zhejiang, China 16,200 m (10.1 mi)[120] 2026[120] Part of the Ningbo–Zhoushan railway. Construction started in December 2020.[121]
Railway Twin Tube Chiltern tunnel United Kingdom Chiltern Hills, United Kingdom 16,040 m (10.0 mi) 2024 Part of High Speed 2,[122] construction started in May 2021,[123] 9.1 m internal diameter[124]
Rail Devprayag Rail Tunnel India Uttarakhand, India 15,270 m

(50,100 ft)

 2024 Part of Rishikesh–Karnaprayag line[125]
Metro Istanbul Metro (Line M9) Turkey Istanbul, Turkey 14,920 m (9.3 mi) 2013–2023
Road New Mount Zigana Tunnel Turkey Torul–Maçka, Turkey 14,481 m (9.0 mi)[126] 2022 Construction started in April 2016
Metro Istanbul Metro (Line M8) Turkey Istanbul, Turkey 14,270 m (8.9 mi) 2022
Road Zoji-la Tunnel India Zoji La Pass, India 14,200 m (8.8 mi)[127] 2026 Construction started in October 2020[128]
Rail Patalpani Rail Tunnel India Madhya Pradesh, India 14,000 m

(46,000 ft)

 2025
Metro MRT Orange Line[129] Thailand Bangkok, Thailand 13,770 m (8.6 mi) 2023 Orange Line Phase 1
Metro İzmir Metro Line M2 Turkey İzmir, Turkey 13,500 m (8.4 mi)[130] 2026
Metro Istanbul Metro (Line M12) Turkey Istanbul, Turkey 13,030 m (8.1 mi) 2024
Road Twin Tube Guigala Tunnel China Tibet, China 12,940 m (8.0 mi)[131] 2023[132] Construction started in January 2017. It bypasses Guigala Pass between Lhasa and Shannan and is situated on a plateau with an average altitude of more than 4,300 meters. Once completed, it will become the longest road tunnel in the world at an altitude of over 4000m.
Possibly incomplete table. Many more tunnels are under construction that will be shorter than 13 kilometres (8 mi)

World's longest tunnels (advanced planning stage)
Type Name Location Length Year Comment
Water supply Tibet Xinjiang Tunnel China Tibet/Xinjiang, China 1,000,000 m (621.4 mi)  ??? China preparing world's longest tunnel to divert Tibet river to desert[133]
Road and railway Taiwan Strait Tunnel China Taiwan Taiwan Strait, China/Taiwan 150,000 m (93.2 mi)  ??? Plans to link Taiwan and Mainland China as part of the G3 Beijing–Taipei Expressway. Approved since 2013 on Chinese side
Railway Bohai Strait tunnel China Bohai Strait, China 123,000 m (76.4 mi)  ??? Tunnel between Dalian on the Liaodong Peninsula and Yantai on the Shandong Peninsula.
Railway Talsinki Finland Estonia

Helsinki/Tallinn, Finland/Estonia

 100,000 m (62.1 mi) After 2030 Awaiting financing
Water supply Qinling Tunnel, Han River Diversion to Wei River China Shaanxi, China 98,300 m (61.1 mi)  ???
Metro Athens Metro Line 4[134] Greece Athens, Greece 33,000 m (20.5 mi) 2028 Start of construction was planned for 2019
Metro Cross Island Line Singapore MRT, Singapore 29,000 m (18 mi)[135] (Phase 1 only) 2029 (Phase 1)
2030/2031 (Phase 2)		 Start of Phase 1 construction was planned for 2020[135]

Phase 2 route not announced

Metro İzmir Metro Line M3 Turkey İzmir, Turkey 32,600 m (20.3 mi) After 2026
Railway Twin Tube Tachlovice Tunnel Czech Republic Prague/Beroun, Czech Republic 24,700 m (15.3 mi)[136] After 2035 Project is on hold
Metro Istanbul Metro (Line M13) Turkey Istanbul, Turkey 21,900 m (13.6 mi) 2020s
Railway and electricity Grimsel Tunnel Switzerland Grimsel Pass, Switzerland 21,720 m (13.5 mi)[137] 2025/2026 Feasibility study
Railway Pacheco Pass Tunnels United States Pacheco Pass, California, United States 21,000 m (13.0 mi) 2031 To be built as part of the California High-Speed Rail project
Road twin tube Kresna Gorge Tunnel[138] Bulgaria Kresna, Bulgaria 15,400 m (9.6 mi) Cancelled Part of Struma motorway, connecting Sofia and Athens.
Road twin tube Agua Negra Tunnel Argentina Chile Agua Negra Pass, Argentina/Chile 14,000 m (8.7 mi)  ??? Awaiting ratification by Chile

World's longest tunnels (abandoned)
Type Name Location Length Year Comment
Water supply Gadara Aqueduct Roman Empire 94,000 m (58.4 mi) 129– Water supply for the Decapolis in present-day Jordan

See also
Wikimedia Commons has media related to Tunnel.

Notes
  1. Length does not include SRL North or West.

References
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