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.
Libreville is the capital and largest city of Gabon, in west central Africa. The city is a port on the Komo River, near the Gulf of Guinea, and a trade center for a timber region. As of 2012 it had a population of 797 003.
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.