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An archipelago of volcanic islands in the western Pacific Ocean south of Japan. The islands formed a major Japanese military stronghold in World War II.
(Placename) a group of 27 volcanic islands in the W Pacific: occupied by the US after World War II; returned to Japan in 1968. Largest island: Chichijima. Area: 103 sq km (40 sq miles). Japanese name: Ogasawara Gunto
Bo′nin Is′lands(ˈboʊ nɪn)
a group of islands in the N Pacific, SE of and belonging to Japan: under U.S. administration 1945–68. 40 sq. mi. (104 sq. km).