Lake Enriquillo
Until 2008, "Cyclura ricordii" was thought to be restricted to two populations in the southern Dominican Republic: one population in the arid Hoya de Enriquillo surrounding the hypersaline Lake Enriquillo including the , and the other in the most xeric portion of the coastal lowlands of Pedernales Province. These are separated by the moister Sierra de Bahoruco, with three peaks exceeding which form an ecological barrier between two populations. Past drier Pleistocene climates may have allowed genetic exchange between the two populations. It is sympatric throughout its range with "C. cornuta cornuta", the rhinoceros iguana. All other Caribbean islands with rock iguanas are home to a single species. In 2008, a third population was found to exist near the town of Anse-a-Pitres in Haiti, near the southernmost coast.