Mammoth Cave National Park surrounds Mammoth Cave, part of the world’s longest known cave system. The park lies in central Kentucky. It was established on July 1, 1941. Mammoth Cave is often called one of the wonders of the Western Hemisphere. The cave is located in a ridge that consists mainly of limestone. Through millions of years, mildly acidic water trickled through cracks in the limestone and wore it away, forming the cave. (World Book 2001) The park's 52,835 acres are located primarily in Edmonson County, Kentucky, with small areas extending eastward into Hart County and Barren County. It is centered around the Green 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, which is South Dakota's Jewel Cave with just over 150 miles (240 km) of known passageway. (Mammoth Cave National Park)
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