壹岐島
The Tsushima Strait measures approximately 100 kilometres along Tsushima Island and is about 65 kilometres wide at its narrowest. The strait has a depth of about 140 metres and is bounded by the "Tsushima Islands" to the west through north (of "Gotō Islands"). Nearby Iki Island lies in the strait about 50 kilometres towards Kyūshū from the southern tip of Kamino-shima (South Island).