Strait of Tartary

Strait of Tartary or Gulf of Tartary is a strait in the Pacific Ocean dividing the Russian island of Sakhalin from mainland Asia, connecting the Sea of Okhotsk on the north with the Sea of Japan on the south. It is 632 km long, 7–23 km wide, and only 4 m deep at its shallowest point.
Data from: en.wikipedia.org