More than 350 miles of passages have been mapped in this longest cave
[DOC] [TLE] GCPAF5 Mammoth Cave, The World's Longest Cave (Earthcache ... [PAR] Jun 14, 2005 ... More than 320, 340, 360, 370 miles of passages have been mapped and the 
surveyors ... And not only is the cave the longest in the world, but cave mappers 
believe the cave system will eventually prove to be 560 miles long!