National Park Service LogoU.S. Department of the InteriorNational Park ServiceNational Park Service
National Park Service:  U.S. Department of the InteriorNational Park Service Arrowhead
Yellowstone National ParkVisitors enjoy a stroll along a boardwalk near a thermal feature.
view map
text size:largestlargernormal
printer friendly
Yellowstone National Park
Site Index
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.

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