The Central African CFA (XAF) is the currency in Chad, CAR, Cameroon, Gabon, Equatorial Guinea and Congo Brazzaville.
Be sure to change any money you have left over before leaving the CFA zone. We tried changing our about 360 euros worth of CFA's at the Congo - DRC border but the rates there were so bad we thought we would leave it until Angola. Bad move, because we haven't been able to change it anywhere afterwards.
So if anyone needs 240.000 Central African CFA let me know haha.