The Congo Basin, which includes parts of Cameroon, Central African Republic, Democratic Republic of Congo, Republic of Congo and Gabon, contains one of the world's largest primary rainforests - second only to the Amazon. The River Congo is some 4,500 km long. It's basin is covered almost entirely by Equatorial rainforests. The central basin is about 300 metres in elevation. The central basin of the River Congo comprises one-third of the Democratic Republic of the Congo, a small part of Congo Brazzaville and the Central African Republic. It is occupied by sluggish rivers that overflow into marshes, swamps and lakes. The lowest part of the depression forms the bed of the River Congo, its major tributaries and the two swampy lakes, Tumba and Mai-Ndombe. The centre of the basin is covered by dense rain forests and the related forms of heavy growth. The River Congo is divided by falls and rapids into three sections: upper, middle and lower Congo.

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