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Island group, western Pacific Ocean. Administratively part of Japan and located about 600 mi (950 km) south of Tokyo, the group consists of islands with a total area of about 40 sq mi (100 sq km). The Bonins include some 30 mountainous Chichi (the largest), Haha, Muko, and Yome islands. They were colonized in 1830 by a group of Europeans and Hawaiians. The islands were formally annexed by Japan in 1876; they were administered by the U.S. in 194568.
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