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The park's 52,830 acres (21,380 ha) are located primarily in Edmonson County, Kentucky, with small areas extending eastward into Hart County and Barren County. It is centered around theGreen River, with a tributary, the Nolin River, feeding into the Green just inside the park. With over 390 miles (630 km) of passageways it is by far the world's longest known cave system, being well over twice as long as the second-longest cave system, South Dakota's Jewel Cave, which has just over 157 miles (253 km) of known passageways.

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12y ago

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