Aniakchak National Monument & Preserve Custom Search 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.   CONTACTS 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 TRAVEL BASICS Operating Hours, Seasons There are no federal facilities at the Monument. Getting There PLANE - Access to the park is by plane or float plane from King Salmon, Alaska or by power boat from any one of the numerous villages along the Pacific Ocean coastline. Weather & Climate Expect windy conditions especially through the 'Gates' area and often within the caldera as well. The coastal area is often shrouded in fog and rain. Accessibility Check with fly-in services for specific needs. There are no accessible trails within the monument/preserve. Getting Around There are a no formal trails within the monument/preserve although open ash fields provide hiking/backpacking opportunities.   Map Detailed Map Contact Info Phone, Email, Address, GPS coordinates Campgrounds Nearby List of Nearby Campgrounds Weather Local weather forecast These outdoors activities are available near Aniakchak National Monument & Preserve.