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Seto-naikai,sea: see Inland SeaInland Sea,
Jap. Seto-naikai, arm of the Pacific Ocean, c.3,670 sq mi (9,510 sq km), S Japan, between Honshu, Shikoku, and Kyushu islands. It is linked to the Sea of Japan by a narrow channel.
..... Click the link for more information. , Japan.