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• A thermal spring in Yellowstone National Park.

• Grand Prismatic Spring in Yellowstone National...

• Emerald Pool is one of the most colorful...

• Emerald Pool is one of the most vibrant thermal...

• Water pools in the cone of a dormant thermal...

• Hikers explore a thermal area in Yellowstone...

• Water pools in the cone of a dormant thermal...

• The vivid springs of Norris Geyser Basin are...

• The Yellowstone River runs through the Grand...

• Navigating the Dearborn River

• An angler casts to Yellowstone Cutthroat Trout...

• A spring cascades over rhyolitic soil in the...

• Old Faithful erupts at dawn in Yellowstone...

• Thermally-heated waters tumble over the...

• Beryl Springs steams beneath a blue sky in...

• A spring cascades over rhyolitic soil in the...

• Old Faithful erupts at dawn in Yellowstone...

• A couple watched Imperial Geyser erupt in the...

• A hiker takes in the view of Grand Prismatic...

• A family walks along the boardwalk at Grand...

• A geyser erupts in Lower Geyser Basin,...

• An angler casts to Yellowstone Cutthroat Trout...

• A geyser percolates in Norris Geyser Basin,...

• A thermal pool bubbles from the earth on the...

• Thermal waters at Yellowstone National Park.