The park contains the headwaters of the Yellowstone River, from which it takes its historical name. Near the end of the 18th century, French trappers named the river Roche Jaune, which is probably a translation of the

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Approximately 96 percent of the land area of Yellowstone National Park is located within the state of Wyoming. Another three percent is within Montana,

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Volcanism
Yellowstone is at the northeastern end of the Snake River Plain, a great U-shaped arc through the mountains that extends from Boise, Idahosome

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As wildfire is a natural part of most ecosystems, plants that are indigenous to Yellowstone have adapted in a variety of ways. Douglas-fir have a thick bark which protects the inner section of the tree from most fires. Lodgepole Pines—the most common tree species in

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Yellowstone climate is greatly influenced by altitude, with lower elevations generally found to be warmer year-round. The record high temperature was 99 °F (37 °C) in 2002, while the coldest

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Yellowstone ranks among the most popular national parks in the United States. Since the mid-1960s, at least 2 million tourists have

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Yellowstone National Park is the centerpiece of the 20 million acres (80,940 km ; 31,250 sq mi) Greater Yellowstone Ecosystem, a region that

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