I have dived across Japan and Korea, from freshwater caves in Florida, across the States to the Channel Islands, and up the West Coast. (teamexplorationdivers.com)
The Dominican Republic sits above a limestone base honeycombed with a system of freshwater caves, tunnels, caverns and grottos, many of which have been opened up for dive tours. (godominicanrepublic.com)
The mystical Blue Hole, a collapsed freshwater cave system is approximately 1000 feet across and over 400 feet deep. (aggressor.com)