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Pennsylvania

Sorry - it's in Kentucky. (Mammoth / Flint Ridge system, well over 350 miles total of surveyed passages.)

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11y ago
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5mo ago

The Mammoth Cave in Kentucky, USA, is the largest known underground cave system in the world, with over 400 miles of passages mapped and explored. It is a popular destination for cave enthusiasts and tourists due to its vast size and unique geological formations.

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Q: The largest known underground cave system in the world?
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