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Aerial view looking north of Okmok caldera, a 9.3-km- diameter (5.8 mi) circular crater that truncates the top of a large shield volcano on the northeastern part of Umnak Island in the eastern Aleutian Islands.
Photograph by J. Reeder. Alaska Division of Geological and Geophysical Surveys, date unknown. Source: http://geopubs.wr.usgs.gov/dds/dds-40/
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