The Cordillera Occidental () is the lowest in elevation of the three branches of the Colombian Andes. The average altitude is and the highest peak is Cerro Tatamá at . The range extends from south to north dividing from the Colombian Massif in Nariño Department, passes north through Cauca, Valle del Cauca, Risaralda, Chocó, and Caldas Departments to the Paramillo Massif in Antioquia and Córdoba Departments. From this massif the range divides further to form the Serranías de Ayapel, San Jerónimo and Abibe. Only to recede into the Caribbean plain and the Sinú River valley. Geography The western part of the mountain range belongs to the Pacific region of Colombia, with the San Juan River being the main watershed, while the eastern part belongs to the Cauca River basin. The northern and northwestern parts belong to the Atlantic Slope, with the Atrato and Sinú Rivers being the main watersheds. The Cordillera Occidental is separated from the coastal Baudó Mountains by the Atrato River. A number of ecoregions cover the cordillera. The Chocó–Darién moist forests cover the western foothills below 1000 meters elevation. The Northwestern Andean montane forests cover the humid western slopes of the range. The Cauca Valley montane forests cover the eastern slopes. Northern Andean páramo covers the highest elevations. Highest peaks Cerro Tatamá – – Chocó & Risaralda Azufral – – Nariño Farallones de Cali – – Valle del Cauca Farallones del Citará – – Antioquia Páramo de Frontino – – Antioquia Cerro Caramanta – – Antioquia, Caldas & Risaralda Cerro Napi – – Cauca Alto Musinga – – Antioquia Cerro Calima – – Valle del Cauca Cerro Paramillo – – Antioquia Cerro Ventana – – Valle del Cauca & Chocó Protected areas The West Andes have the following nationally protected areas from south to north: PNN Munchique PNN Farallones de Cali PNN Tatamá PNN Las Orquídeas PNN Paramillo Other areas under consideration for national protection include: Serranía del Pinche Serranía de los Paraguas Locally protected areas Yotoco Forest Reserve Bitaco River Forest Reserve Recreation areas Dapa Calima Lake See also Geography of Colombia Andean Region, Colombia Cordillera Central (Colombia) Cordillera Oriental (Colombia) References Mountain ranges of the Andes Occidental