Nankai Trough

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The yellow line is the "Suruga trough", part of the longer "Nankai trough" in red

Nankai Trough (南海トラフ, Nankai Torafu) is a submarine valley south of Japan's islands of Honshū and Shikoku. It is about 900 km offshore. The undersea valley runs on a line which is roughly parallel with the coast of the two Japanese islands.[1]

This feature is in a marine area called Nankai.[2]

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