These islands are riddled with caves and sinkholes. During the last ice age the sea level was much lower than today, and rainwater percolating down through porous limestone dissolved underground cavities and channels along faults and fissures. The roofs of some of the larger cavities collapsed to form sinkholes.
Yesterday we found deep in the bush what I believe to be the biggest sinkhole on Exuma, perhaps a hundred meters across and ten meters deep. We climbed down the wall to find a unique flora of giant ferns, soaring fig trees, and air plants. A journey to the Lost World.