Mount Katmai

mountain, Alaska, United States

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June 30, 2026

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Mount Katmai is a volcano located in the Aleutian Range of southern Alaska, United States. It is situated at the northeastern end of the Alaska Peninsula. In 1912, a massive eruption from the nearby Novarupta volcano, along with Mount Katmai, created the Valley of Ten Thousand Smokes. This eruption was one of the largest in recorded history, ejecting vast amounts of volcanic material into the atmosphere. The summit of Mount Katmai collapsed, forming a large crater that now holds a lake. The area is now part of Katmai National Park and Preserve, known for its wilderness, unique geological features, and abundant wildlife, particularly grizzly bears.123

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Valley of Ten Thousand Smokes
…eruption of the Novarupta and Mount Katmai volcanoes. Its name derives from the myriad fumaroles (fissures spouting smoke, gas, and steam) that developed in the valley floor. Covering about 56 square miles (145 square km), it is now a part of Katmai National Park and Preserve.
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…eruption of the Novarupta and Mount Katmai volcanoes. Its name derives from the myriad fumaroles (fissures spouting smoke, gas, and steam) that developed in the valley floor. Covering about 56 square miles (145 square km), it is now a part of Katmai National Park and Preserve.
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Aleutian Range
… and include many volcanoes, notably Katmai (6,715 feet [2,047 metres]), Veniaminof (8,225 feet [2,507 metres]), and Redoubt (10,197 feet [3,108 metres]). The range, named for the Aleuts who inhabit the island region, embraces Lake Clark National Park and Preserve, Katmai National Park and Preserve (including the Valley of Ten Thousand…
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… and include many volcanoes, notably Katmai (6,715 feet [2,047 metres]), Veniaminof (8,225 feet [2,507 metres]), and Redoubt (10,197 feet [3,108 metres]). The range, named for the Aleuts who inhabit the island region, embraces Lake Clark National Park and Preserve, Katmai National Park and Preserve (including the Valley of Ten Thousand…
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Novarupta
…as well as that of Mount Katmai nearly 10 km (6 miles) away, which caused the later to sink by several hundred feet into a newly formed 800-metre- (roughly 2,600-foot-) deep caldera.
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…as well as that of Mount Katmai nearly 10 km (6 miles) away, which caused the later to sink by several hundred feet into a newly formed 800-metre- (roughly 2,600-foot-) deep caldera.
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