Unimak Island
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Unimak Island is the largest island in Alaska's Aleutian Islands chain. It is home to Shishaldin, one of the ten most active volcanoes in the world.
An interesting physical feature is Fisher Caldera, a crater. It is in the west-central part of Unimak. Some characteristics include many colvanic cones and undrained lakes. It is named for Bernard Fisher, a U.S. Geological Survey geologist who was killed in the Umnak Pass.