Tsugaru Strait

Nihongo|Tsugaru Strait津軽海峡|Tsugaru Kaikyō is a channel between Honshū and Hokkaidō in northern Japan connecting the Sea of Japan with the Pacific Ocean. It was named after the western part of Aomori Prefecture. The Seikan Tunnel passes under it at its narrowest point (19.5 km) between Tappi Misaki on the Tsugaru Peninsula in Aomori, Honshū and Shirakami Misaki on the Matsumae Peninsula in Hokkaidō.

Japan applies the 3-nautical-mile (5.6 km) territorial limit to the Tsugaru Strait and allows foreign ships to pass through the Strait.

The Tsugaru Strait has eastern and western necks, both approximately 20 km across with maximum depths of 200 and 140 m respectively. [cite journal| author=Tsuji, H., Sawada, T. and Takizawa, M. | title=Extraordinary inundation accidents in the Seikan undersea tunnel | journal=Proceedings of the Institution of Civil Engineers, Geotechnical Engineering | year=1996 | volume=119 | issue= 1 | pages=1–14]

In the past, the most common way for passengers and freight to cross the strait was on ferries, approximately a four-hour journey. Now the Seikan Tunnel provides a convenient but more expensive alternative and approximately halves the travel time in comparison to ferrying. When Shinkansen trains can traverse the tunnel to Hakodate (scheduled for 2015), the journey time will be cut to 50 minutes. [cite journal| author=Morse, D. | title=Japan Tunnels Under the Ocean | journal=Civil Engineering | year=May 1988 | volume=58 | issue = 5 | pages=50–53]

In 1954, 1,155 lives were lost in the strait, on the freightliner Toya Maru.Fact|date=August 2008

Thomas Blakiston, an English explorer and naturalist, noticed that animals in Hokkaidō were related to northern Asian species, whereas those on Honshū to the south were related to those from southern Asia. The Tsugaru Strait was therefore established as a major zoogeographical boundary, and became known as the "Blakiston Line".Fact|date=August 2008

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