Western maps made prior to the 20th century also referred to this waterway as theStrait of Sangar.[1]
Japan's territorial waters extend to three nautical miles (5.6 km) into the strait instead of the usual twelve, reportedly to allownuclear-armedUnited States Navy warships and submarines to transit the strait without violating Japan's prohibition against nuclear weapons in its territory.[2] Despite this, the part of the Tsugaru Strait considered to be ininternational waters is still within Japan'sexclusive economic zone,[3] and theSeikan Tunnel remains entirely under Japanese jurisdiction even though part of it is technically outside Japan's territorial waters.
The Tsugaru Strait has eastern and western necks, both approximately 20 km across with maximum depths of 200 m and 140 m respectively.[4]
On September 26, 1954, 1,172 people died when the ferryTōya Maru sank in the strait.[5]
Thomas Blakiston, an English explorer and naturalist, noticed that animals in Hokkaido were related to northern Asian species, whereas those on Honshu to the south were related to those from southern Asia. The Tsugaru Strait was therefore established as a major zoogeographical boundary, and became known asBlakiston's Line or the "Blakiston Line".[6]
^Tsuji, H., Sawada, T. and Takizawa, M. (1996). "Extraordinary inundation accidents in the Seikan undersea tunnel".Proceedings of the Institution of Civil Engineers - Geotechnical Engineering.119 (1):1–14.doi:10.1680/igeng.1996.28131.{{cite journal}}: CS1 maint: multiple names: authors list (link)
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