Japan, Sea Of

Japanese  Nihon-kai,  Russian  Yaponskoye More,  Korean  Tonghae,   marginal sea of the western Pacific Ocean. It is bounded by Japan and Sakhalin Island to the east and by Russia and Korea on the Asian mainland to the west. (The Korean name means “East Sea.”) Its area is 377,600 square miles (978,000 square kilometres). It has a mean depth of 5,748 feet (1,752 metres) and a maximum depth of 12,276 feet (3,742 metres).