city, on Zamboanga (Zamboanga Peninsula) peninsula, northwestern Mindanao, Philippines. The city lies on Panguil Bay, an extension of Iligan Bay of the Bohol (Mindanao) Sea. It was the site of Spanish fortifications dating from 1574, with one extant fort surviving from 1707. Incorporated in 1948, it is the largest population centre in the area. The city is an active port and an important centre for processing coconuts. It has an airport. Pop. (2000) 110,420.