Nature
Yunaska Island is an uninhabited volcanic island in the Aleutian Islands of southwestern Alaska and the largest in the Islands of Four Mountains group, covering 66.834 square miles. It consists of two volcanic mountains divided by a valley. The western mountain is composed of four overlapping, eroded stratovolcanoes and includes a cinder cone field at its western end, with no recorded historic eruptions. The eastern mountain is a large shield volcano with two overlapping summit calderas and last erupted in 1937.
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Nikolski, Alaska · United States