Aniakchak National Monument and Preserve
This parkland of 586,000 acres contains an extraordinary living volcano that rises to the south of Katmai. Towering more than 4,400 feet above the landscape, the volcano also has one of the largest calderas in the world, with a diameter averaging 6 miles across and 2,500 feet deep. Although Aniakchak last erupted in 1931, geologists place the first eruption after the last ice age because of the lack of glaciation. The Aniakchak climate brews mist, clouds, and serious wind much of the year. The caldera is so big that it can create its own weather patterns, and it really seems to like the bad stuff. Although the Aniakchak River (which drains Surprise Lake) is floatable, it has stretches of Class III and IV white water navigable only by expert river runners, and you must travel through open ocean waters to reach the nearest community, Chignik Bay (or get picked up by plane, along the coast). In other words, this is not a place for the unprepared or untested. An alternate way to enjoy Aniakchak is to wait for a clear day and fly to it in a small plane that will land you on the caldera floor or on Surprise Lake. There are no trails, campgrounds, ranger stations, or other visitor facilities here, though there are plenty of bears and mosquitoes.
