Suraksan Tunnel

Suraksan Tunnel is a tunnel on the Seoul Ring Expressway connecting Sanggye-dong, Nowon-gu, Seoul and Jangam-dong, Uijeongbu, Gyeonggi-do. It is made up of a pair of tunnels with four lanes going each way, and the length is 2,950 m in both directions. The width and height are the same as the other tunnels on the same route. Uijeongbu IC is to the north-west of the tunnel, and Sanggye-dong is to the southeast of the tunnel.

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Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).

Other tunnels in South Korea

Delaware Aqueduct United States · 137 km Päijänne Water Tunnel Finland · 120 km Orange–Fish River Tunnel South Africa · 82.8 km Ishikawa Tunnel Japan · 78.5 km Brenner Base Tunnel Austria · 64 km Mont d'Ambin base tunnel France · 57.5 km Gotthard Base Tunnel Switzerland · 57.09 km Hong Kong–Zhuhai–Macau Bridge China · 55 km