Tsushima Island (Japan) size comparison
709 km2 / 274 mile2
Tsushima Island is an island of the Japanese archipelago situated in-between the Tsushima Strait and Korea Strait, approximately halfway between Kyushu and the Korean Peninsula. The main island of Tsushima, once a single island, was divided into two in 1671 by the Ōfunakoshiseto canal and into three in 1900 by the Manzekiseto canal.
The island group measures about 70 km (43 mi) by 15 km (9 mi) and had a population of about 34,000 as of 2013. The main islands (that is, the “North” and “South” islands, and the thin island that connects them) are the largest coherent satellite island group of Nagasaki Prefecture and the eighth-largest in Japan.