Nature
Mount Shishaldin, an active volcano on Unimak Island, is the highest peak in the Aleutian Islands and one of their most recognizable mountains because of its isolated, nearly perfect cone. Less than 10,000 years old, the present cone rises above an older volcano and is heavily covered in snow and ice, with a small summit crater that has long emitted steam. Formed by subduction along the Aleutian Trench, it is among the Aleutians’ most active volcanoes, with 40 confirmed eruptions in the last 11,700 years, including notable modern eruptions in 1999, 2019, and 2023–2024. Its remoteness and weather make monitoring and visits difficult.
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False Pass, Alaska · United States
