The Province of Basilan (Zamboangueño: Provincia de Basilan; Filipino: Lalawigan ng Basilan) is an island province of the Philippines within the Autonomous Region in Muslim Mindanao (ARMM). Basilan Island is the largest and northernmost of the major islands of the Sulu Archipelago. It is located just off the southern coast of the geographic Zamboanga Peninsula. Its capital, Isabela City, is grouped together with Basilan for geographical and statistical purposes, but is administered independently as part of the Zamboanga Peninsula Region.