- a strait between the Russian island Sakhalin to the east and the Asian mainland to the west, connecting the Sea of Okhotsk and the Sea of Japan. 393 miles (632 km) long, narrowing to 5 miles (7 km) wide.
- an arm of the Pacific between the mainland of SE Russia and Sakhalin Island, linking the Sea of Japan with the Sea of Okhotsk. Length: about 560 km (350 miles)
