Moro Gulf is a gulf in Mindanao in the Philippines. It is part of Celebes Sea[?] and is surrounded by the Zamboanga Peninsula and the central part of Mindanao. Sibuguey Bay[?] and Illana Bay[?] are its major branches. Zamboanga City is the most important port city on its coast. Cotabato City[?], on the eastern coast, is another major port.