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© WWF CARPO/Jules Decolvanaere

The forests of the Green Heart of Africa

Aerial view of Cameroon’s coastal forest area in the Littoral province.

Congo Basin map rel= © WWF

Where are we?

The Congo River Basin covers a massive area concentrated in a narrow band of land that straddles the equator. The basin is drained by the Congo River and covers approximately 3.7 million km2, slightly more than the size of India and France put together.

A massive forest expanse of 1.5 million km2 covers the area, spreading across the Democratic Republic of Congo (DRC), most of Congo-Brazzaville, the southeastern reaches of Cameroon, southern Central African Republic (CAR), Gabon and Equatorial Guinea - extending well beyond the actual limits of the Congo River Basin.

A panorama of the region

The forests of the Congo River Basin stretch from the Ruwenzori Range, on the flanks of the Albertine Rift in eastern DRC, to the Atlantic coast of the Gulf of Guinea.

The Ruwenzoris reach 3,000 m and the highest points are permanently snow-capped. Smaller mountain ranges are found around the Gulf of Guinea, such as the Monts de Alen and Monts de Cristal.

The second largest river in the world in terms of the amount of water it carries, the Congo River drains the basin as it cuts across the region. At the eastern side of the Congo River Basin there are swamps and lakes that play an important role in regulating the flow of the river.

A varied climate depending on latitude and altitude

The northern forests have a hot, severe dry season, which increases in intensity as one moves away from the equator. The forests of the western parts of the region have a much cooler dry season, with coastal areas subject to tropical monsoon climate conditions, especially in the Gulf of Guinea.

Rainfall and temperature patterns in Central Africa vary considerably, with unpredictable seasonal variations.1 Some of the heaviest rains in the world are experienced at the foot of Mount Cameroon, around 10,000 mm annually.

The central part of the Congo River Basin and the foothills of the mountain range that borders the Albertine Rift also receive a lot of rainfall (2,000 – 3,000 mm per year), while the rest of the dense forest gets relatively little (1,500 mm - 1,800 m per year).

Little temperature variation

There is little temperature variation in the lowland coastal forests, mostly because persistent cloud cover keeps mean annual temperatures between 26°C and 28°C. Things are cooler up in the mountains, where mean annual temperatures vary between 19°C and 24°C.2
Forests of Central Africa 
© Congo Basin Forest Partnership
Forests of Central Africa
© Congo Basin Forest Partnership

Closed circuit rainfall

A critical feature of the Congo Basin forests is that they generate between 75% and 95% of their own rainfall - the remainder originates from outside the basin.

This differs dramatically from other major tropical watersheds of the world. The Amazon Basin, for example, recycles only about 50% of its water, while the remaining half is brought in by westerly winds.

So what could happen if the forest cover was severely reduced? In all likelihood, the vast quantity of rainfall these forests once generated would no longer be available. Because only a small amount of the rainfall in the basin comes from outside the area, the local climate would most likely be significantly affected, with serious consequences for local inhabitants.

Hippopotamus amphibius
in Virunga National Park, Democratic Republic of Congo. © WWF / Sandra MBANEFO OBIAGO

What will you encounter in the forests of the Congo River Basin?

These forests are the home of threatened forest elephants and the hideaway of gorillas, bongos,okapis and countless other species. Some 400 mammal species, 1,000 bird species and quite likely over 10,000 plant species (of which 3,000 are found nowhere else) are reported to live in the Congo River Basin. Scientists are constantly discovering more species.

Who lives there?

From deep within the forests to major urban centres, some 29 million people live in Congo River Basin, where they are divided into more than 250 indigenous groups. Most people remain heavily dependent on forests for subsistence and raw materials, as a complement to agricultural activities.
Find out more

1,2 UNEP. 2002. AFRICA ENVIRONMENT OUTLOOK: Past, present and future perspectives.