As of 2022, what is the world's longest cave system?

Correct answer: Mammoth–Flint Ridge Cave System, U.S.A

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What people think about it: 3 Comments

drummerboy75

Been there, twice! Amazing natural beauty! Go and see!

Vel

Went to Mammoth Cave for my Senior class trip in 1956. Beautiful!

Player #4547841

Incredible! I would like to explore those some day! I think there's a better chance I'll hike to the north pole though but maybe in another life!