The CFA Franc
The CFA Franc (Central African Franc) is the currency of Gabon, Chad, Cameroon, the Central African Republic, Republic of the Congo, and Equatorial Guinea. The CFA Franc is pegged to the Euro with a rate of 1 Euro = CFA 655.957. At present, 1 US Dollar = CFA 443.67.
If traveling to a country that uses the CFA Franc, it will be difficult to change currency before arriving in your host country. Most currency exchanges in international airports do not have the CFA Franc. Be sure to use a bank to change currency, not people who offer such services informally.