Kunashir (Russian: Кунаши́р, koo-nah-SHIHR) is the southernmost of the Kuril Islands in Sakhalin Oblast. Known Kunashiri (国後) in Japanese, the island is only 24 km away from Hokkaido, Japan, and is visible on a clear day. Appropriately enough, the Japanese characters mean "after the country", although the original Ainu name actually means "Black Island". Although part of the Kuril Islands, Kunashir is officially part of Japan.
Like the other southern Kuril Islands, Kunashir is still claimed by the Japanese.