Tsugaru Strait

The Tsugaru Strait is the waterway between Honshu and Hokkaido that connects the Sea of Japan with the North Pacific Ocean. It is a major passage for ships and a natural barrier between the islands.

Tsugaru Warm Current: A warm ocean current that flows through the Tsugaru Strait into the North Pacific. It carries water from the Sea of Japan through the strait.
Tsugaru Line: A biogeographic boundary across northern Japan, associated with the separation of fauna between Honshu and Hokkaido. The strait marks the marine divide underlying this boundary.
Seikan Tunnel: A railway tunnel beneath the seabed connecting Honshu and Hokkaido. It is the fixed rail crossing beneath the strait.
Tōya Maru: A Japanese railway ferry that sank in the Tsugaru Strait during a 1954 typhoon. Its loss became the best-known maritime disaster in the strait.
Mogi Line: A boundary used in Japanese maritime law to delimit territorial waters in the Tsugaru Strait. It reflects the strait’s unusual status under Japan’s territorial-sea rules.
Last Glacial Period: The most recent geological period of repeated glaciations, ending about 11,700 years ago. Lower sea levels altered connections and migration routes around Japan.
Hakodate: A port city in southern Hokkaido, Japan, near the Tsugaru Strait. Its harbor has served as a major northern gateway across the waterway.
Tōya Maru disaster: The 1954 sinking of the ferry Tōya Maru in a typhoon, with more than a thousand deaths. It prompted renewed attention to safer transport between Honshu and Hokkaido.
Tsugaru Strait ferry: Ferry services that have carried passengers and vehicles between ports on Honshu and Hokkaido. Ferries provide a surface route across the strait alongside the undersea railway.
Jōmon period: A prehistoric period in Japanese history known for its hunter-gatherer communities and distinctive pottery. Archaeological evidence traces ancient human movement and exchange across the strait.

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