Which US state has the most caves? Tennessee. Missouri has the second most, and a new one has been announced.
On that day in November 2010, McCain and fellow explorers were mapping Blackfathom River Cave. Since its discovery in 2007, cavers have documented 7 miles of this glistening, highly decorated underground waterway in southern Ste. Genevieve County.
It is now Missouri’s seventh-longest known cave, and one of its most unusual, with its big fish and breathtaking cave formations.
This is the 7,000th documented cave by the Missouri Speleological Society in the state, according to the article.