Near the center of the island, this range turns southward and is called Sierra de Ocoa, finishing near the city of Azua de Compostela, on the Caribbean coast. Another branch, Cordillera Oriental or Sierra del Seibo, is separated from the main chain by a karstic region (Los Haitises) and with a west–east direction; it is located south of Samaná Bay. The San Juan Valley and Plain of Azua are big valleys south of the Cordillera Central with altitude from 0 to 600 m.