Aniakchak Crater
Mount Aniakchak, Aniakchak National Monument and PreserveLake and Peninsula County, Alaska
Aerial-view of the caldera of Mount Aniakchak from the west
Photo: United States Geological Survey
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Aniakchak is an extant volcano. The caldera formed during a major eruption in 1645 B.C. The most recent eruption was in 1931. Surprise Lake within the caldera is the source of the Aniakchak River, a National Wild River.
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