Which strait separates the Korean Peninsula from the Japanese island of Kyushu?

The Korea Strait separates the Korean Peninsula from Japan’s island of Kyushu. It is a sea passage in East Asia linking waters including the East China Sea, the Yellow Sea, and the Sea of Japan.

The strait is roughly 200 kilometres wide and is divided by Tsushima Island into two channels. The western channel lies between Korea and Tsushima, while the eastern channel—often called the Tsushima Strait—lies between Tsushima and Japan’s main islands. In broad geographic usage, both are associated with the Korea Strait.

A branch of the powerful Kuroshio Current flows through the passage as the Tsushima Current. The waterway is also a major commercial route, carrying shipping toward ports in southern South Korea and Japan. Passenger ferries connect Busan with Japanese destinations including Fukuoka and Tsushima.

The Bering Strait is a different passage between Russia and Alaska, while the Tsugaru Strait lies between Honshu and Hokkaido. Those names can be tempting because they are also important East Asian or North Pacific waterways, but they do not separate Korea from Kyushu.