Mammoth Cave: World’s Longest Cave In Kentucky Just Got Longer, Over 600 Miles Still Unmapped – Dahboo77

The longest cave in the world just got even longer — at least officially speaking.

Mammoth Cave National Park in Kentucky said researchers found another 8 miles of passages while mapping the immense underground geological marvel. The new discovery by the Cave Research Foundation brings the total length to 420 miles, officials said.

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