Zamboanga Peninsula, officially designated as Region IX, is an administrative region in the Philippines occupying the western section of Mindanao. It covers 3 provinces, namely, Zamboanga del Norte, Zamboanga del Sur, and Zamboanga Sibugay, as well as 1 highly urbanized city (Zamboanga City) and the component city of Isabela. The regional center is the City of Pagadian.