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![National Park Service: U.S. Department of the Interior](https://webarchive.library.unt.edu/eot2008/20090506194304im_/http://www.nps.gov/imr/templates/images/graphics/prntarrw.gif) ![National Park Service Arrowhead](https://webarchive.library.unt.edu/eot2008/20090506194304im_/http://www.nps.gov/imr/templates/images/graphics/prnttitl.gif) |
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Yellowstone National Park
Bookstore
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![Upper Geyser Basin Hydrothermal Features on a Winter Day. Upper Geyser Basin Hydrothermal Features on a Winter Day.](https://webarchive.library.unt.edu/eot2008/20090506194304im_/http://www.nps.gov/imr/customcf/apps/CMS_HandF/Pictures/YELL_thermal.jpg) |
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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: February 24, 2009 at 10:49 EST |