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National Park ServiceRoosevelt Arch is at the park's North Entrance
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Upper Geyser Basin Hydrothermal Features on a Winter Day.  

Did You Know?
Yellowstone contains approximately one-half of the world’s hydrothermal features. There are over 10,000 hydrothermal features, including over 300 geysers, in the park.

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Last Updated: July 25, 2006 at 00:23 EST