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| Address Email - Kristi_Bergeron@nps.gov Fax- 907-246-4286 Write to Aniakchak National Monument & Preserve P O Box 7 King Salmon, AK 99613 Phone Headquarters - 907-246-3305 The Aniakchak Caldera, is the result of a series of eruptions, the latest in 1931. Nearly six miles in diameter and covering some ten square miles, it is one of the finest examples of dry caldera in the world. Located in the volcanically active Aleutian Mountains, the crater contains many outstanding examples of volcanic features, including lava flows, cinder cones, and explosion pits. Surprise Lake, located within the caldera, is the source of the Aniakchak River, which cascades through a 1,500-foot gash in the caldera wall. The site also contains the Aniakchak Wild River. The Aniakchak Caldera, a volcanic crater measuring almost 6 miles in diameter, is a spectacular sight and a truly awesome example of nature's power. Created over the last 3,400 years by a series of volcanic eruptions-the most recent occurring in May 1931-the caldera possesses outstanding examples of volcanic features, with numerous explosion pits, lava flows, and cinder cones. The largest cone, Vent Mountain, rises 1,400 feet above the caldera floor. The walls of the caldera vary in height, generally ranging between 2,000 and 4,400 feet. Surprise Lake glistens within the caldera and serves as the source of the Aniakchak River, which offers an unparalleled whitewater rafting experience. The river cuts a 1,500-foot opening (known as "The Gates") in the caldera wall, and then briskly flows east, winding around the mountains of the Aleutian Range, before spilling out into Aniakchak Bay and the Pacific Ocean. Other popular activities in and around the caldera include camping, fishing, hiking, and wildlife viewing. With its remote location along the Alaska Peninsula, the Aniakchak National Monument and Preserve can be accessed only via floatplane. |
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