The Sanaga River (formerly ) is the largest river in Cameroon located in East Region, Centre Region and Littoral Region. Its length is about from the confluence of Djérem and Lom River. The total length of Sanaga-Djérem River system is about . Djérem is the longest source of Sanaga River with a total length of 464.5 km.
Course The Sanaga River has its source at the Adamawa Plateau. It is formed by the confluence of the Djérem and Lom Rivers in the north of the East Region. Djérem River has a total length of and Lom River a total length of . Apart from these originating rivers, the largest tributary of the Sanaga is Mbam River with a total length of .
Basin and Tributaries The Sanaga river is situated in the central of Cameroon, and it is one of the essential headstreams, the Agoua and the Djérem meet to form the Sanaga which is about 56 miles (90km) north, northwest of Bertoua. The river then flows about 325 miles (525km) southwest across the central plateau past Nanga-Eboko, Djérem. It extends to a wide estuary that roughly bisects or divides Cameroon's Atlantic coastline 30 miles (48km) south of Douala.
Climate The Sanaga River forms a boundary between two tropical moist forest ecoregions. The Cross-Sanaga-Bioko coastal forests lie to the north between the Sanaga River and the Cross River of Nigeria, and the Atlantic Equatorial coastal forests extend south of the river through southwestern Cameroon and Equatorial Guinea, Gabon, the Republic of the Congo, Cabinda and the Democratic Republic of the Congo.
Hydrology The flow of the river was measured at Edéa in m3/s:
Dams and reservoirs Beginning at the headwaters, there are 2 dams on the Sanaga River:
Dam Nameplate capacity(MW) Reservoir Surface area (km) Total capacity(million m3) Song Loulou 384 10 Edea 264
Impact of rainfall variability The main forcing of river discharge variability is Climate change. However, having the comprehension of their simultaneous impacts on river discharges remains limited in some parts of the world like central Africa. The changes that occur in river discharges generally result from interactions between climate change and/or land-use changes, although it is also admitted that the physical characteristics of the watershed (size, slope system, type of soil, etc.) increase their sensitivity to these factors.
Transport
The Camrail railway bridges the Sanaga River at Edea.
Biodiversity and conservation The Sanaga River supports one of Central Africa's richest freshwater ecosystems and contains numerous endemic fish species that are restricted to the Sanaga basin. The river also provides habitat for freshwater molluscs, aquatic plants, and migratory bird species associated with riparian wetlands.
Hydroelectric development has modified sections of the river, particularly through the construction of dams such as Edéa, Song Loulou, Lom Pangar, and Nachtigal. While these projects contribute substantially to Cameroon's electricity production, they have also raised concerns regarding fish migration, sediment transport, and ecological connectivity.
Conservation efforts increasingly focus on balancing hydropower production with environmental flow management and the protection of aquatic biodiversity throughout the Sanaga basin.
References
Further reading