Mt. Apo is the highest mountain in the Philippines and located in Mindanao area in Cotabato with a scale of 2,956 MASL. And the second highest is Mt. Dulang-Dulang in Bukidnon and have a scale of 2938 MASL. And the third highest is Mt. Pulag located in Benguet with 2922 MASL.
Here's the Tatlong Bundok, Isang Grupo, a documentary of The Probe Team way way back that explains how these three mountains are important to us and to our eco-system. See the video by part. Just simply select the number below.