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Yellowstone National Park is the centerpiece of the Greater Yellowstone Ecosystem, the largest intact ecosystem in the Earth's northern temperate zone.
Yellowstone became the world's first national park on March 1, 1872.
Located mostly in the U.S. state of Wyoming, the park extends into Montana and Idaho.
The park is known for its wildlife and geothermal features; the Old Faithful Geyser is one of the most popular features in the park.
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