 The sea has complex tides, which are induced by the tidal wave of the Pacific Ocean penetrating through the Korea Strait and Tsugaru strait.The tides are semi-diurnal (rise twice a day) in the Korea Strait and in the northern part of the Strait of Tartary.They are diurnal at the eastern shore of Korea, Russian Far East and the Japanese islands of Honshū and Hokkaidō.