Basilan
Island and city, southern Philippines, in the Celebes Sea. Basilan island lies 5 miles (8 km) off the southern tip of the Zamboanga Peninsula of Mindanao, across the Basilan Strait. With an area of 495 square miles (1,282 square km), it is the largest and northernmost island of the Sulu Archipelago. Most of the island consists of rugged or rolling forested uplands, with several volcanic
