Q: What is the longest cave in...
Q: What is the longest cave in the world?
A: According to the U.S. Geological Survey, the longest cave in the world is Mammoth Cave, in Kentucky, at 580,000 yards. That is three times longer than the runner-up, Optimisticeskaja in Ukraine, which is 180,000 yards long. The deepest cave is reseau Jean-Bernard in Haute-Savoie, France, which is 1,678 yards deep. The longest vertical drop in a cave is 363 yards in Las Golondrinas, Mexico.
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