Northwestern Congolian lowland forests
The ecoregion is located in western central Africa, across the meeting of Cameroon, Gabon, Republic of Congo, and the Central African Republic (CAR). It stretches 500 km west-to-east and 700 km north-to south, set back 250 km from the Gulf of Guinea. Mean elevation is 530 meters, ranging from 79 meters to 1451 meters. The highest areas are in the Chaillu Mountains of south Gabon and the Republic of Congo in the south. Much of the terrain sits on a heavily leached red oxisols. The region is heavily forested and sparsely populated. The surrounding ecoregions are the Congolian coastal forests to the west, the Northern Congolian forest–savanna mosaic to the north, the Western Congolian forest–savanna mosaic to the south, and the Western Congolian swamp forests to the east. The climate of the ecoregion is "Tropical monsoon climate" (Köppen climate classification (Am)). This climate is characterized by relatively even temperatures throughout the year (all months being greater than average temperature). This climate is mid-way between a tropical rainforest and a tropical savannah. Minimum temperatures range from 18 to 21 degrees (C) to 27 to 30 degrees (C). Precipitation ranges from 1,400 mm/year to 2,000 mm/year in the center of the ecoregion. Over 90% of the ecoregion is closed forest of broadleaf evergreen. Another 6% is other types of open or closed forest, and 3% is herbaceous cover. Characteristic tree species are "Entandrophragma congoense, Pentaclethera eetveldeana, Pericopsis elata" (also known as African teak), and "Gilbertiodendron dewevrei". Raffia palm is found along the rivers. Primates richness is the highest in Africa; Cameroon alone has 29 species of primate, including the Western lowland gorilla, the vulnerable mandrill ("Mandrillus sphinx"), and the endangered Chimpanzee ("Pan troglodytes"). A 2017 assessment found that 91,395 km², or 21%, of the ecoregion is within protected areas. 40% of the unprotected area is still forested. Protected areas include:





Dzanga-Sanga, Dzanga-Ndoki, Nouabale-Ndoki, and Lobéké national parks and the Dzanga Sangha Special Reserve form the transboundary Dzanga-Sangha Complex of Protected Areas that extends across 4,589 km² of Cameroon, Central African Republic, and Republic of the Congo.
Location and description
The Northwestern Congolian lowland forests is a tropical moist broadleaf forest ecoregion that spans Cameroon, Gabon, the Republic of Congo, and the Central African Republic. It forms part of the larger Congolian rainforests region in Central Africa. There are also large populations of forest elephants.