Aniakchak National Monument and Preserve geographical name
Park, southern shore of the Alaska Peninsula, U.S. Situated in the volcanically active Aleutian Range, it consists primarily of a great dry caldera, which last erupted in 1931. The crater has an average diameter of 6 mi (10 km). Declared a national monument in 1978, it covers 942 sq mi (2,440 sq km).
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