Ko Island or Kojima is an uninhabited volcanic island in the Sea of Japan, 23 kilometres southwest of the mainland portion of the town of Matsumae and is the southernmost point in Hokkaidō. It is under the administration of the district of Matsumae in Oshima Subprefecture in Hokkaido, Japan. To distinguish Ko Island from other islands with the same name, it is so…Ko Island or Kojima is an uninhabited volcanic island in the Sea of Japan, 23 kilometres southwest of the mainland portion of the town of Matsumae and is the southernmost point in Hokkaidō. It is under the administration of the district of Matsumae in Oshima Subprefecture in Hokkaido, Japan. To distinguish Ko Island from other islands with the same name, it is sometimes known as Oshima Ko Island or Matsumae Ko Island.
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