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The Seto Inland Sea (瀬戸内海, Seto Naikai), eften shortened tae Inland Sea, is the body o watter separatin Honshū, Shikoku, an Kyūshū, three o the fower main islands o Japan.
Coordinates: 34°10′N 133°20′E / 34.167°N 133.333°E / 34.167; 133.333