The Yellowstone River is the longest undammed
river in the continental United States. Its name
comes from the yellow sandstone cliffs on either
side of it.
Yellowstone contains about one-half of the
world's hydrothermal features. There are about
10,000 in the park, including more than 300 geysers.
Bison are the largest land mammals in North
America. More than 3,000 bison roam the grasslands
of Yellowstone year-round.
Check In Why do you think it is important to preserve the natural environment of Yellowstone?
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