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Old Faithful and some 10,000 other geysers and hot springs make this the Earth's greatest geyser area. Here, too, are lakes, waterfalls, high mountain meadows, and the Grand Canyon of the Yellowstone--all set apart in 1872 as the world's first national park. The last volcanic eruptions in Yellowstone are said to have occurred 600,000 years ago.
Established March 1, 1872.
Designated a Biosphere Reserve 1976. Designated a World Heritage Site, Sept. 6, 1978.
Acreage 2,219,790.71
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Images of Yellowstone National Park
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