Yellowstone
Established in 1872, Yellowstone National Park is America’s first national park. Yellowstone contains half of all the world’s known geothermal features and has the world’s largest concentration of geysers.
Sapphire Pool, Yellowstone National Park, USA
Sapphire Pool, named for its blue, crystal-clear water and for its resemblance to an Oriental sapphire, was once a placid hot pool.
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