Balay na Santiago, Santiago City Nestled in the heart of the Cagayan Valley The province of Isabela is the second largest in the Philippines located in the Cagayan Valley with Ilagan as its capital. Bordered by the provinces of Cagayan to the north, Kalinga to the northwest, Mountain province to its central-west and to the south by Santiago, Ifugao and Nueva Vizcaya to its southwest, and the...