Tsushima may refer to: Tsushima, Nagasaki, a city in Nagasaki Prefecture (coterminous with Tsushima Island) Tsushima Basin, also known as Ulleung Basin, located at the juncture of the Sea of Japan and the Korea Strait Tsushima Island, part of Nagasaki Prefecture Tsushima Province, a historical province, coterminous with modern Tsushina Subprefecture Tsushima Subprefecture, an administrative subdivision of Nagasaki prefecture (coterminous with Tsushima Island) Tsushima Fuchū Domain,… (More on Tsushima)