The Isle of Youth presents to the north, the Sierras de Casas y de Caballos, where the black sands of its northern beaches, mix with the crystalline whiteness of the south littorals, thus being the Lanier Swamp (Ciénaga de Lanier), The Marine Park at Punta Francés and the caves at Punta del Este, the Sistine Chapel of the Cuban cave art, distinctive places for ecotourism.