Nature
Roundtop Mountain is a stratovolcano on Unimak Island in Alaska’s Aleutians. Its nearest higher neighbor is Isanotski Peaks, about 5.9 miles to the west-southwest. The volcano’s last known eruption took place sometime between 9,100 and 10,000 years ago, placing its activity deep in prehistory. In modern mapping history, Lieutenant Commander J. F. Moser of the U.S. Navy first called the feature “Dome” in 1897, and the United States Coast and Geodetic Survey recorded it as “Round Top” in 1902.
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False Pass, Alaska · United States