Basilan, officially the Province of Basilan (Chavacano: Provincia de Basilan; Yakan: Wilayah Basilanin; Tausug: Wilaya' sin Basilan; Tagalog: Lalawigan ng Basilan) is an island province of the Philippines located primarily in the Bangsamoro Autonomous Region. Basilan Island is the largest and northernmost of the major islands of the Sulu Archipelago. It is just off the southern coast of the geographic Zamboanga Peninsula.