The hot waters of Black Pool

From USGS Volcanoes:

The hot waters of Black Pool, at the West Thumb geyser basin sit just above the still-frozen waters of Yellowstone Lake in this May 2009 photo. The Absaroka Mountains lie in the distance, just beyond the far edge of the Yellowstone Caldera. Photo by J. Lowenstern. http://volcanoes.usgs.gov/observatories/yvo. 
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