LONGEST Cave System in the World - Mammoth Cave, Kentucky, USA - Superlatives on Waymarking.com

The Mammoth-Flint Ridge Cave System has formed under a sandstone ridge which gives it great stability. With more than 400 miles of explored passageways, it is by far the longest known cave system in the world. The second- longest system, the Sac Actun underwater cave in Mexico, is not even half as long. Large parts of the cave are protected by a U.S. National Park.

Source and more information: (visit link)

Type of documentation of superlative status: Wikipedia, NPS: https://en.m.wikipedia.org/wiki/Mammoth_Cave_National_Park , http://www.nps.gov/maca/index.htm Location of coordinates: Main Parking Lot Web Site: [Web Link]

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