The Pinar del Río province is Cuba 's westernmost province and contains one of Cuba 's three main mountain ranges , the Cordillera de Guaniguanico , divided into the easterly Sierra del Rosario and the westerly Sierra de los Órganos .
The Pinar del Río province has one of Cuba 's three main mountain ranges , the Cordillera de Guaniguanico . The mountains are divided into the easterly Sierra del Rosario and the westerly Sierra de los Organos .