What US state has more caves than any other state in the US?
According to the Tennessee Cave Survey, Tennessee has more than 10,000 caves, which is more than any other state in the country. That's approximately 20 percent of all known caves in the country.
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We are cave-rich because underground streams have been eroding our region's limestone for millions of years, creating everything from tiny cracks to endless galleries to huge arenas, all below the surface of the earth.
Most caves form through the dissolution of limestone by acidic groundwater. Limestones of the Paleozoic age are a common bedrock in the Appalachian Plateau and Valley and Ridge provinces of northwest Georgia, and those limestones are riddled with caves and other features formed by solution processes.
Planning a Visit? Mammoth Cave in Kentucky is the world's longest known cave system, with more than 400 miles explored, and one of the oldest tour attractions in North America.
The Geological History of the Jenolan CavesScientists have determined, through the examination of the clay found in the caves, that the Jenolan subterranean system is around 340 million years old. This makes it the oldest known and dated open cave system in the world, and it is still being heavily researched today.