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Mammoth Cave: 426 miles, still growing
Explore the world's longest cave system beneath south central Kentucky, Mammoth Cave: a geologist's paradise with 426 miles of passageways and ongoing growth.
The Mammoth Cave, located deep under the hills of Kentucky, is the longest cave system in the world with an officially surveyed length of 426 miles (686 kilometres) according to the U.S. National Park ...
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