Yellowstone National Park

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Set aside as a national park on March 1, 1872, Yellowstone was the first National Park and is known for its wildlife and geothermal features, especially Old Faithful Geyser, one of the most popular areas in the park.

Yellowstone National Park spans an area of 3,472 square miles (8,987 km²).

Half of the world's geothermal features are in Yellowstone.

Yellowstone has numerous recreational opportunities, including hiking, camping, boating, fishing and sightseeing.

The park sits on the Yellowstone Plateau, at an average altitude of 8,000 feet (2,400 m) above sea level.

Yellowstone National Park has one of the world's largest petrified forests, trees which were long ago buried by ash and soil and transformed from wood to mineral materials.

The Yellowstone Caldera is the largest volcanic system in North America. It has been termed a "supervolcano" because the caldera was formed by exceptionally large explosive eruptions.

Yellowstone is widely considered to be the finest wildlife habitat in the lower 48 states. There are almost 60 species of mammals in the park, including the endangered gray wolf, the threatened lynx, and grizzly bears.