Cagayan Valley

Cagayan Valley, is an administrative region in the Philippines, located in the northeastern section of Luzon Island. It is composed of five Philippine provinces: Batanes, Cagayan, Isabela, Nueva Vizcaya, and Quirino. The region hosts four chartered cities of Cauayan, Ilagan, Santiago, and Tuguegarao.Most of the land area is situated on the valley between the Cordilleras and the Sierra Madre mountain ranges. The eponymous Cagayan River, the country's largest and longest, runs through the region and flows from the Caraballo Mountains and ends at Aparri. Cagayan Valley is the second largest Philippine administrative region by land area. According to a literacy survey in 2013, 97.2% of Cagayan Valley's citizens are functionally literate, which is the highest out of the seventeen regions of the Philippines.