Nature
Isanotski Peaks is a multipeaked volcanic mountain on Unimak Island at the eastern end of Alaska’s Aleutian chain. Locally called Ragged Jack, it rises about 8,025 feet and stands east of Shishaldin Volcano. Geologically, it is an old, heavily eroded stratovolcano whose rugged pinnacles set it apart from the younger, smoother cones common in the region. That jagged form gives it a severe profile and makes it harder to climb or ski than nearby Shishaldin. Eruptions once assigned to Isanotski in 1825 and the 1840s were later linked instead to Shishaldin, leaving Isanotski’s last eruption unknown.
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False Pass, Alaska · United States
