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(also Trung Phan, Trung Ky), the central part of Vietnam, comprising ten provinces. Area, 146,000 sq km. Population, 12.5 million (1975). The largest cities in Trung Bo, which is primarily an agricultural region, are Da Nang, Qui Nhon, Nha Trang, Cam Ranh, Phan Rang, and Phan Thiet. From the seventh to tenth centuries the kingdom of Annam occupied what is now Trung Bo.