壱岐島
Tsushima was an important trade center during this period. After the Toi invasion, private trade started between Goryeo, Tsushima, Iki Island, and Kyūshū, but halted during the Mongol invasions of Japan between 1274 and 1281. The "Goryeosa", a history of the Goryeo dynasty, mentions that in 1274, Korean troops of the Mongol army led by killed a great number of people on the islands.