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In which US states is Yellowstone National Park located?

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Yellowstone National Park: Old Faithful — Yellowstone National Park Old Faithful geyser erupting, Upper Geyser Basin, Yellowstone National Park, northwestern Wyoming, U.S.

Yellowstone National Park is primarily located in northwestern Wyoming. However, it also extends into southern Montana and eastern Idaho. This vast protected area is renowned for its abundant hydrothermal features and is recognized as the United States' first national park.123