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Strait, northwestern Pacific Ocean. It extends from the Sea of Japan (East Sea) to the open ocean between the islands of Honshu and Hokkaido, Japan. It is 15–25 mi (24–40 km) wide. The Seikan Tunnel linking Aomori and Hakodate cities runs beneath the strait. Completed in 1988, it is the longest railway tunnel in the world; 14.5 mi (23.3 km) of its 33.5 mi (53.9 km) length lie under the strait.
This entry comes from Encyclopædia Britannica Concise. For the full entry on Tsugaru Strait, visit Britannica.com.