Guéra was one of the 14 prefectures of Chad. Its capital was Mongo. Located in the south of the country, Guéra covered an area of 58,950 square kilometers and had a population of 306,253 in 1993, of which 263,843 were sedentary (rural: 219,884; urban: 43,959) and 42,810 were nomadic. The predominant ethno-linguistic groups were the Hadjerai (66.18%) and the Arabs (21.11%).