1. an arm of the Pacific Ocean in southern Japan; surrounded by the islands of Honshu and Shikoku and Kyushu and linked to the Sea of Japan by a narrow channel; the chief port is Hiroshima;
WordNet (r) 3.0 (2006):
Inland Sea
n 1: an arm of the Pacific Ocean in southern Japan; surrounded
by the islands of Honshu and Shikoku and Kyushu and linked
to the Sea of Japan by a narrow channel; the chief port is
Hiroshima