Central Africa is a subregion of the African continent comprising various countries according to different definitions. Middle Africa is an analogous term used by the United Nations in its geoscheme for Africa and consists of the following countries: Angola, Cameroon, Central African Republic, Chad, Democratic Republic of the Congo, Republic of the Congo, Equatorial Guinea, Gabon, and São Tomé and Príncipe. The United Nations Office for Central Africa also includes Burundi and Rwanda in the region, which are considered part of East Africa in the geoscheme. These eleven countries are members of the Economic Community of Central African States (ECCAS). Six of those countries are also members of the Economic and Monetary Community of Central Africa (CEMAC) and share a common currency, the Central African CFA franc.