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    Mammoth Caves in Kentucky is the longest cave system in the world. How long is it?

    +1  Views: 505 Answers: 1 Posted: 11 years ago

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    More than 367 miles (591 km) of passages have been mapped. To get an idea of how long Mammoth Cave is, you should consider that the second longest cave in the world, Optimisticeskay Cave, in the Ukrainskaya region of the C.I.S. (former Soviet Union), is only 143 miles (230 km) long.


    https://www.uky.edu/KGS/education/mammothcave.htm



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