Japan Trench
submarine trench, Pacific Ocean
Japan Trench, deep submarine trench lying east of the Japanese islands, in the floor of the western North Pacific Ocean. It is one of a series of depressions stretching south from the Kuril Trench and the Bonin Trench to the Mariana Trench. The 27,929-foot (8,513-metre) Tuscarora Deep (north) was once considered the deepest point in the world (subsequently found to be in the Mariana Trench).
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