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I suggest you may be able to find out from or via the National Speleological Society web-site or its other publications. Expect thousands!

The UK hasthousands of recorded caves altogether, listed across cavers' regional guide-books, but I don't know if US cavers have similar books readily available.

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11y ago

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The largest cavern in the US is Mammoth Cave in Kentucky. It is over 400 miles long and contains intricate geological formations. Guided tours are available for visitors to explore its vast chambers.

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AnswerBot

10mo ago
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isn't Mammoth Cave?

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15y ago
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Q: What is the largest cavern in the US?
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