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In the U.S.
UMNAK ISLAND, ALASKA
Umnak Island, the third largest Aleutian Island, is home to a large volcanic caldera on Mt. Okmok. Since the destruction of Beowawe and Steamboat Hot Springs, Umnak is the second largest geyser field in the United States, after Yellowstone. The Umnak field contains at least 12 geysers scattered within several groups of hot spring.
Credit: C. Nye, U.S. Geological Survey Department of the Interior,
Alaska Division of Geological and Geophysical Surveys
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