Cordillera Central (Luzon) Sierra Madre Mountains, the longest mountain range in the country, through the Caraballo Mountains in Nueva Vizcaya province. During Spanish colonial period, the whole range was called "Nueva Provincia", (New Province). The Cordillera Central is the highest mountain range in the Philippines. It comprises about 1/6 of the whole Luzon island with a total area of . The highest mountain in the range, Mount Pulag, is also the highest mountain on Luzon Island at . It is officially the third highest mountain in the country after Mount Dulang-dulang and Mount Apo on Mindanao Island, the second largest island of the
Mount Apo been generating 42.5 MW of clean and renewable energy for Davao since 2010. The first of two cascading plants, Sibulan A Hydro produces 16.5 MW and the water it utilizes is re-used in the Sibulan B Hydro to produce 26 MW. Sibulan A was completed and commissioned on December 26, 2010. Local residents who are mainly engaged in abaca and fruit farming have since benefited from the use of of farm-to-market roads which were developed as access to the plants. Six indigenous groups, the Manobos, Bagobo, Ubos, Atas, K’Iagans and Tagacaolo, live in the area of Mount Apo. They consider