• Aerial view of Aniakchak Caldera taken from northern rim

    Aniakchak

    National Monument & Preserve Alaska

No Lines, No Waiting!

Given its remote location and challenging weather conditions, Aniakchak is one of the most wild and least visited in places in the National Park System. This landscape is a vibrant reminder of Alaska's location in the volcanically active "Ring of Fire" as it is home to an impressive six mile (10 km) wide, 2,500 ft (762 m) deep caldera formed during a massive volcanic eruption 3,500 years ago.

Did You Know?

Did You Know?

The outlet of the Aniakchak River, referred to as "The Gates," was formed when water within the caldera breached the rim and carved through the wall. Terrace deposits above the current water level of Surprise Lake indicate that the lake once filled 50 percent more of the caldera.