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Tsushima has area of approximately 709 square km (Geographical Survey Institute H16 .4.1) in north and south 82km to be located at the northernmost tip of Kyushu, slim island of East-West 18km and is big island to the fourth in Japan next to Okinawa Island, Sadogashima, Amami Oshima.
The north faces the Korean Peninsula across the Korea Strait; the shortest distance to peninsula is 49.5km. The south faces Iki, the Kyushu mainland across Tsushima Channel, and sea route to Hakata is 138km.