"At 150 miles, Jewel Cave continues to be the second longest cave in the world, following 367-mile-long Mammoth Cave in Kentucky."Link to Jewel Cave National Monument.
Hat tip: the Bu bro.
Wednesday, March 3, 2010
Jewel Cave...
in South Dakota reaches 150 miles of mapped passage. Impressive, but it still has a long way to go to catch the leader:
Hat tip: the Bu bro.
Hat tip: the Bu bro.
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