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The oldest, one of the largest, and probably the best-known national park in the United States. It is situated in northwestern Wyoming and partly in southern Montana and eastern Idaho and includes the greatest concentration of geothermal features in the world. The park was established by the U.S. Congress on March 1, 1872, as the nation’s—and the world’s—first national park. It was designated a World Heritage site in 1978. The park, almost all of which remains undeveloped, covers 3,468 square miles (8,983 square km) and consists mostly of broad volcanic plateaus with an average elevation of 8,000 feet (2,440 metres). Among the mountain ranges that protrude into the park are the Gallatin Range on the northwest, the Absaroka Range on the east, and the Tetons along the park’s southern boundary. The park is also surrounded by the Custer, Shoshone, Teton, Targhee, Beaverhead, and Gallatin national forests. - Yellowstone National Park

Official Site for Yellowstone National Park

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