Mammoth Cave is the most extensive cave system in the world, with over 456 km
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Mammoth Cave National Park is a U.S. 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.
The park's 52,830 acres (21,380 ha) are located primarily in Edmonson County, with small areas extending eastward into Hart County and Barren County. It is centered on the Green River, with a tributary, the Nolin River, feeding into the Green just inside the park. With 405 miles (652 km) of surveyed passageways Mammoth Cave is by far the world's longest known cave system, being nearly twice as long as the second-longest cave system, Mexico's Sac Actun underwater cave. - in: wikipedia
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