Global Volcanism Program | Image GVP-05335
The 4.5-km-wide Ugashik caldera formed during the late Pleistocene. Five Holocene lava domes are in the caldera, seen here from the east with Upper Ugashik Lake in the background.
Photo by Betsy Yount (Alaska Volcano Observatory, U.S. Geological Survey).
This image is made available as a Public Domain Work, but proper attribution is appreciated.