Longest caves in the United States:
1. Mammoth Cave System, Kentucky
2. Jewel Cave, South Dakota
3. Lechuguilla Cave, New Mexico
4. Wind Cave, South Dakota
5. Fisher Ridge Cave System, Kentucky
More Top Five Lists
1. Mammoth Cave System, Kentucky
2. Jewel Cave, South Dakota
3. Lechuguilla Cave, New Mexico
4. Wind Cave, South Dakota
5. Fisher Ridge Cave System, Kentucky
More Top Five Lists
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