Emerald Pool, a hot spring named for its emerald green color, is one of the main attractions at Black Sand Basin Hot Springs in Yellowstone National Park. Its temperature is and its dimensions are with a depth of . The color is due to growth of yellow bacteria and algae. Cooling, the result of objects thrown into the pool and natural debris, has affected the growth of the bacteria and algae, making the pool appear orange and brown around the edges.
See also Emerald Spring
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