USGS map showing Tsushima Island in the Korea StraitMap showing the western channel (Korea Strait) and the eastern channel (Tsushima Strait)
The Korea Strait (Korean: 대한해협, Daehan Haehyeop), also known as the Tsushima Strait, is a narrow body of water between Japan and South Korea.[1] The name is used in two ways. It identifies the sea between Korea and Tsushima Island;[2] and it is also used generally to describe the wider ocean area between Korea and the island of Kyushu.[3]