Mount Aniakchak (Russian: ) is a 3,700-year-old volcanic caldera approximately 10 kilometers (6 mi) in diameter, located in the Aleutian Range of Alaska, United States. Although a stratovolcano by composition, the pre-existing mountain collapsed in a major eruption forming the caldera. The area around the volcano is the Aniakchak National Monument and Preserve, maintained by the National Park Service. In November 1967, Aniakchak Caldera was designated as a National Natural Landmark by the National Park Service.
Source: Wikipedia

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