Cordilleras and Caraballos
The Cordilleras and Caraballos, together with the Sierra Madre Range, form the main mountain system in Northern Luzon.
The Cordilleras consists of 2, sometimes 3, mountain ranges that are found in northwestern central Luzon. The first, called Caraballo del Sur, forms the nucleus of the system and has its highest peaks in the border between the provinces of Abra, Ilocos Norte and Cagayan. The next, called Caraballo Occidentalles, is further divided into 2 ranges, the Cordillera Norte and Cordillera Central. They line the central portions of the Cordillera Administrative Region.
The Caraballos (Caraballo de Baler) start where the Sierra Madre and the Cordilleras meet. They are found south of Cagayan Valley, northeast of the Central Luzon Plains.
Read more about this topic: Geography Of The Philippines, Terrain, Luzon