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See Emerald Pool (Black Sand Basin), Yellowstone National Park, Wyoming

Emerald Pool 154.6 °F (68.1 °C) is located at Black Sand Basin in Yellowstone National Park. Black Sand Basin was originally called the Emerald Group, a name given to it by A. C. Peale in 1878 but tourists started calling it Black Sand Basin and that name stuck. The main draw of the basin used to be "Handkerchief Pool", people would drop a handkerchief in the pool, currents would carry it away, and after a short time it would rise back to the surface, freshly cleaned.
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