Cagayan Valley is an administrative region in the Philippines located in the northeastern portion of Luzon. It is composed of five provinces: Batanes, Cagayan, Isabela, Nueva Vizcaya, and Quirino. The region has four cities: Cauayan, Ilagan, Santiago, and Tuguegarao. Most of the region lies in a large valley in northeastern Luzon, between the Cordilleras and the Sierra Madre mountain ranges. The eponymous Cagayan River, the country's largest and second longest, runs through its center and flows out from its source in the Caraballo Mountains in the south to the Luzon Strait in the north, in the town of Aparri, Cagayan. The region encompasses the outlyin...
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