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Cave Attractions In Portland

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Portland is the largest city in the U.S. state of Oregon and the seat of Multnomah County. It is a major port in the Willamette Valley region of the Pacific Northwest, at the confluence of the Willamette and Columbia rivers. The city covers 145 square miles and had an estimated population of 647,805 in 2017, making it the 26th most populous city in the United States, and the second-most populous in the Pacific Northwest. Approximately 2,424,955 people live in the Portland metropolitan statistical area , making it the 25th most populous MSA in the United States. Its Combined Statistical Area ranks 18th with a population of 3,160,488. Roughly 60% of Oreg...
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Cave Attractions In Portland

  • 1. Mammoth Cave National Park Mammoth Cave National Park
    Mammoth Cave National Park is an American national park in central Kentucky, encompassing portions of Mammoth Cave, the longest cave system known in the world. Since the 1972 unification of Mammoth Cave with the even-longer system under Flint Ridge to the north, the official name of the system has been the Mammoth–Flint Ridge Cave System. The park was established as a national park on July 1, 1941, a World Heritage Site on October 27, 1981, and an international Biosphere Reserve on September 26, 1990. The park's 52,830 acres are located primarily in Edmonson County, with small areas extending eastward into Hart and Barren counties. The Green River runs through the park, with a tributary called the Nolin River feeding into the Green just inside the park. Mammoth Cave is the world's longes...
    From Wikipedia, the free encyclopedia.

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