Ouham is one of the 16 prefectures of the Central African Republic. Its capital is Bossangoa. Geography The prefecture is in the north-west of the Central African Republic. In the north it has a border with Chad. In the south is the prefecture Ombella-Mpoko, in the west the prefecture Ouham-Pendé and in the east the prefectures Nana-Grébizi and Kémo. References Prefectures of the Central African Republic