Tim Fitzharris / Tourists viewing Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, Wyoming
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Jim Brandenburg / Aerial view of Grand Prismatic Pool, Yellowstone National Park, Wyoming
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Jim Brandenburg / Aerial view of Grand Prismatic Pool in winter, Midway Geyser Basin, Yellowstone National Park, Wyoming
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Nick Garbutt / Steam rising from Grand Prismatic thermal pool in snow covered landscape. Midway Geyser Basin, Yellowstone National Park, USA. February 2019.
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Ingo Arndt / Grand Prismatic Spring, edge of pool, Midway Geyser Basin, Yellowstone National Park, Wyoming, USA
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Kirkendall-Spring / Grand Prismatic Spring in the Midway Geyser Basin of Yellowstone National Park, Wyoming, USA, June 2013.
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Ingo Arndt / Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, Wyoming
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Ingo Arndt / Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, Wyoming
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Ingo Arndt / Tourists viewing Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, Wyoming
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Ingo Arndt / Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, Wyoming
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Yva Momatiuk & John Eastcott / Hikers admiring Grand Prismatic Pool, Yellowstone National Park, Wyoming
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Yva Momatiuk & John Eastcott / Bacterial mats in Grand Prismatic Pool, Yellowstone National Park, Wyoming
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Yva Momatiuk & John Eastcott / Bacterial mats in Grand Prismatic Pool, Yellowstone National Park, Wyoming
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Yva Momatiuk & John Eastcott / Sky reflected in Grand Prismatic Pool, Yellowstone National Park, Wyoming
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Yva Momatiuk & John Eastcott / Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, Wyoming
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Jack Dykinga / Grand prismatic pool at dawn with terraces of bacteria mats and red algae in foreground, Yellowstone NP, Wyoming, USA
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Tim Fitzharris / Steam rising off Grand Prismatic Pool in Midway Geyser Basin, Yellowstone National Park, Wyoming
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Jim Brandenburg / Aerial view of Grand Prismatic Pool, Yellowstone National Park, Wyoming
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Ingo Arndt / Burned trees in front of Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, Wyoming
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Ingo Arndt / Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, Wyoming
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Suzi Eszterhas / American Bison (Bison bison) tracks at the steaming Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, Montana
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Jim Brandenburg / Aerial view of Grand Prismatic Pool, Yellowstone National Park, Wyoming
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Jim Brandenburg / Aerial view of Grand Prismatic Pool, Yellowstone National Park, Wyoming
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Jack Dykinga / Grand Prismatic Pool at sunset, creating steam, with terraces of bacteria mats and red algae, Yellowstone National Park, Wyoming, USA.
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Jeff Foott / Hot spring, Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, Wyoming
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Jeff Foott / Water flowing from hot spring into river, Grand Prismatic Pool, Firehole River, Midway Geyser Basin, Yellowstone National Park, Wyoming
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Jeff Foott / Hot spring and tourists, Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, Wyoming