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O-shima (ō-shēˈmä) [key], island, c.35 sq mi (90 sq km), near the entrance to Tokyo Bay, E Japan. The largest and most northerly of the Izu-shichito group, it is the site of volcanic Mt. Mihara (2,477 ft/7,550 m), which last erupted in 1986. Agriculture and fishing are chief activities there. It is a recreation area for Tokyo. The island was visited (17th cent.) by Maarten Vries, the Dutch navigator.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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