Black Opal Pool, Biscuit Basin, Yellowstone National Park, WY
Black Opal Pool with Firehole River in the background at at Biscuit Basin, Yellowstone National Park, Wyoming.
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- Rozanne Hakala
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bacteria hot spring trees outdoors Yellowstone National Park bacterial mats Black Opal Pool landscape microorganisms YNP park geothermal tourism U.S. Wyoming caldera National Park Service azure Firehole River USA colorful UNESCO World Heritage Site Yellowstone algae river thermal WY Biscuit Basin springs scenic tourist thermophiles Rozanne Hakala
- Contained in galleries
- Yellowstone & Grand Tetons
