Stretching from Cagayan to Quezon, Sierra Madre Mountain Range is truly the longest mountain range in the Philippines. It covers 10 provinces and stands proudly at 6,069 feet. It contains the largest remaining tract of old-growth tropical rainforest in the Philippines which is about 1.4 million hectares of forest, representing 40% of the country’s forest cover.It is also one of the major drivers of the Philippine economy, as its watersheds provide services that support major infrastructure, including dams that irrigate thousands of hectares of farm lands in Central Luzon and the Cagayan Valley region, as well as water utilities and power plants that supply Manila, the capital and industrial center of the Philippines. It serves as a typhoon barrier, attenuating incoming typhoons from the Pacific Ocean before reaching the central mainland.