Gabon has a population that is estimated at 1,545,255. Historical and environmental factors caused Gabon's population to decline between 1900 and 1940.Gabon has one of the lowest population densities of any country in Africa, and the fourth highest Human Development Index in Sub-Saharan Africa.
CFA (Communauté Financière Africaine) Franc (XAF; symbol CFA) = 100 centimes. Notes are in denominations of CFA10,000, 5,000, 2,000, 1,000 and 500. Coins are in denominations of CFA500, 100, 50, 25, 10, 5 and 1.
The main river in Gabon, Ogooue River, arcs across the entire country, with major tributaries including Ivindo and Mpassa. Its mouth is at Port Gentil, on the Atlantic Coast, and it originates in the Republic of the Congo.