Bluespring Caverns is a massive karst system with 21 miles of surveyed tunnels. It is famous for having the longest portion of an underground river in a cave in the United States, with 3 miles of navigable river. Access to the cave is currently controlled by Bluespring Caverns Park, a commercial operation. The main tour consists of an hour-long boat ride on the subterranean river.
Posted by Greg Heil on March 14, 2012
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