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The largest caves in the US are found in Kentucky's Mammoth Cave National Park. Mammoth Cave is the world's longest known cave system, with over 400 miles of explored passages. It is a popular destination for cave tours and exploration.
Over 390 miles
You could try Kentucky - home of the Mammoth / Flint Ridge system, whose near-400 miles of surveyed passages make it the world's longest cave!
if you mean the longest, it's the Flint Ridge Cave / Mammoth Cave system (Kentucky) - also the world's longest known cave - with well over 350 miles of surveyed passages.
Stephen Bishop was slave guide who discovered more than 20 miles of Mammoth cave.
mammoth cave KY is a cave in Kentucky that is really, really, really long i mean miles long
Mammoth Cave near Cave City, Kentucky, is the world's longest cave. More than 390 miles of passages have been mapped. Mammoth Cave is three times longer than its nearest competitor. Not only is the cave the longest in the world, but cave mappers believe the cave system will eventually prove to be 560 miles (900 km) long. 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.It is 4.6 miles long.
With more than 350 miles of surveyed passageways, Mammoth Cave is at least 3 times longer than any cave known. How long might it be? Geologists estimate that there could be as many as 600 miles of yet undiscovered passageways.
It is 208 miles according to Google Maps.
Caves can vary greatly in length, ranging from a few meters to several kilometers. Some of the longest known caves in the world, like the Mammoth Cave in the United States, stretch for more than 600 kilometers. The length of a cave depends on factors such as the geological conditions, the water flow that formed it, and the erosion processes.
Its sheer length - the combined Mammoth Cave / Flint Ridge cave system holds well over 350 miles of surveyed passages; the world's longest known cave. Apart from thatalthough the system is a normal karst cave(in limestone) so holds examples of typical cave passage morphologies, calcite formations etc, it is as individual as any cave - one of the values that make caves so fascinating!
Being the longest cave explored (350 miles)