Umnak (ōmˈnăk) [key], island, c.83 mi (134 km) long, off SW Alaska, one of the largest of the Aleutian Islands. A volcanic peak, Mt. Vsevidof, 7,236 ft (2,206 m) high, is there.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.
More on Umnak from Fact Monster:
See more Encyclopedia articles on: U.S. Physical Geography