islands of Japan in the Korea Strait, between Kyushu & Korea: 272 sq mi (704 sq km)
See Tsushima in American Heritage Dictionary 4
Two islands of southwest Japan in Korea Strait between Kyushu and southeast South Korea. They are separated from Kyushu by Tsushima Strait, the site of a major naval battle (May 1905) in the Russo-Japanese War in which the Russian fleet was largely destroyed.