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is an uninhabited island in the Sea of Japan, to the west from Matsumae town and therefore the westernmost point in Hokkaidō. It is part of the town of Matsumae in Matsumae District, Oshima Subprefecture in Hokkaidō, Japan. To distinguish Ōshima from other islands with the same name, it is sometimes known as or . At , Ōshima is the largest uninhabited island under Japanese sovereignty. The island is a double caldera with a scoria hill rising in the middle. It is the peak of two overlapping stratovolcanoes and their associated calderas, Mount Higashi and Mount Nishi. The highest peak, at , is part of a triple volcano. The peak rises close to from the sea floor. The island consists of mafic alkali and non-alkali volcanic rock, less than 18,000 years old. On the south side of the island at , there is a lighthouse and a heliport operated by Japan Coast Guard. Because of volcanic activity and nature conservation, landing on the island requires the approval of the Agency for Cultural Affairs. ==History== Because of the island's isolation and volcanic activity there are almost no records of its past left behind. had a major eruption on 27 August 1741. The next day a tsunami struck the opposite shore and killed 1,467 people from Kumaishi to Matsumae. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Oshima (Hokkaido)」の詳細全文を読む スポンサード リンク
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