Strait of Tartary (Gulf of Tartary, Gulf of Tatary, Tatar Strait, Tartar Strait, Strait of Tartar) is a strait in the Pacific Ocean. It divides the Russian island of Sakhalin from mainland Asia. It connects the Sea of Okhotsk on the north with the Sea of Japan on the south. It is 900 km long, 4–20 m deep, and 7.3 km wide at the narrowest point.