The Seikan Tunnel (青函トンネル Seikan Tonneru or 青函隧道 Seikan Zuidō) is a 53.85 km (33.46 mi) dual gauge railway tunnel in Japan, with a 23.3 km (14.5 mi) long portion under the seabed. The track level is about 100 metres (330 ft) below the seabed and 240 m (790 ft) below sea level. It extends beneath the Tsugaru Strait—connecting Aomori Prefecture on the main Japanese island of Honshu with the northern island of Hokkaido—as part of the standard gauge Hokkaido Shinkansen and the narrow gauge Kaikyo Line portion of the Hokkaido Railway Company (JR Hokkaido)'s Tsugaru-Kaiky Line.The Seikan Tunnel is the deepest operational main-line rail tunnel in the world and the longest undersea tunnel in the world.
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