Lake Enriquillo
This valley was once an arm of the sea and upon withdrawal of the latter during the uprising Oligocene Miocene, salt water was trapped in the lowest points of depression resulting in two grand lakes; the Etang Saumâtre (also called "Lake Azuéi") in Haiti and Lake Enriquillo in the Dominican Republic and a small freshwater pond called Trou Caïman, also in Haiti.