The world’s longest cave is the Mammoth Cave System. It is located in the state of Kentucky in the USA. It is 390.000 miles long, which is 627644 meters long. That gives it a depth of 379 feet or 115.5 meters.
After that the Jewel Cave in South Dakota, USA measures in at 157.360 miles long.
The site below lists the first 300 longest caves in the world and there’s lots of information about the length and depth of them all. Check out the site for more information.
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