Though Puerto Rico does not sport any authentic lakes, it does have 15 reservoirs which are commonly referred to as lakes. These man-made bodies of water were created by damming up its main rivers to collect water for irrigation and to generate electricity. However, this hydroelectricity only accounts for one percent of the country’s total electricity, as petroleum is the main source for its generation. Though Puerto Rico does not have any natural lakes, it does contain lagoons, which are formed by sea water that is trapped by a sandbar or coral reef. These include the Condado and San Jose in San Juan, Piñones and Torrecillas in Carolina, Joyuda in Cabo Rojo, and Laguna Tortuguero in Manatí.