Mount Augustine is an active volcanic caldera located off the southern coast of the Alaska Peninsula, known for frequent eruptions and dramatic submarine-to-summit activity.

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Geography

ContinentNorth America
RegionAlaska Peninsula
SubregionBering Sea
CountryUnited States
StateAlaska
CountyAleutians East Borough
DistrictUnimak Island
TimezoneAmericaAnchorage
Latitude54.21
Longitude-163.04
Maps
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Mount Augustine is an active caldera volcano on the Unimak Island and part of the Aleutian Volcanic Arc, rising roughly from sea level to about 2,670 meters (8,760 feet). Its summit is a broad, breached caldera that sometimes hosts small lava domes or explosive activity. The volcano is known for frequent eruptions—most recently in the 2005–2006 period—and for its accessibility by maritime routes. The region around the volcano supports rich marine life, making most approaches to the island and base camps reliant on ship or small aircraft. Visitors are typically scientists, flight operators, or remote-cruise passengers rather than traditional tourist hikes; routes and safety procedures depend heavily on current volcanic activity, weather, and local pilot guidance.

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