Aniakchak National Monument and Preserve
P.O. Box 7
King Salmon, AK 99613-0007

Phone: 907-246-3305

The Aniakchak Caldera, covering some 30 square miles, is one of the great dry calderas in the world. Located in the volcanically active Aleutian Mountains, the Aniakchak last erupted in 1931. The crater includes lava flows, cinder cones, and explosion pits, as well as Surprise Lake, source of the Aniakchak River, which cascades through a 1,500-foot gash in the crater wall. NO FEDERAL FACILITIES.