Aniakchak Caldera
Aniakchak National Monument, known as the Broken Mouth caldera, is a remote and largely undeveloped volcanic alpine zone on Alaska’s Aleutian Peninsula. Access is seasonal and challenging, but offers epic wilderness crossings, active volcanic features, and opportunities for backcountry hiking and rafting. The primary visitor approach is via the Aniakchak River, with safety and survival skills essential.
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Geography
| Continent | North America |
|---|---|
| Region | Alaska |
| Subregion | Southcentral Alaska |
| Country | United States |
| State | Alaska |
| County | Lake and Peninsula Borough |
| District | Aniakchak River watershed |
| Timezone | AmericaAnchorage |
| Latitude | 52.833 |
| Longitude | -157.017 |
| Maps |
10:53 AM LOCAL TIMEAniakchak National Monument (formerly Aniakchak BP), on the Alaska Peninsula, is an extreme volcanic landscape carved by the giant 1931 eruption that formed its namesake caldera. The site is a raw, wind-swept alpine bowl, incised by the Aniakchak and Becharof rivers and dotted with fumaroles, hot springs, and a large ice-fed lake. Human presence is sparse; access is chiefly by river and is constrained by seasonal weather, making trip planning and safety paramount. Visitors come for multi-day paddling, cross-country trekking, and to witness dynamic volcanic and glacial terrain. Common routes involve rafting the Aniakchak or Becharof and navigating remote landings and crossings; infrastructure is minimal and wilderness skills are a must.
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