Sanaga River
Longest river in Cameroon
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The Sanaga River (formerly German: Zannaga) is the largest river in Cameroon located in East Region, Centre Region and Littoral Region. Its length is about 603 km (375 mi) from the confluence of Djérem and Lom River. The total length of Sanaga-Djérem River system is about 1,067.5 km (663.3 mi). Djérem is the longest source of Sanaga River with a total length of 464.5 km.
CountryCameroon
RegionsEast Region, Centre Region, Littoral Region
CitiesEdéa, Nanga Eboko, Bélabo
SourceConfluence of Djérem River and Lom River[1]
| Sanaga River | |
|---|---|
The Sanaga River after the Edea Hydroelectric Power Station | |
 Map of the Sanaga River drainage basin | |
| Location | |
| Country | Cameroon |
| Regions | East Region, Centre Region, Littoral Region |
| Cities | Edéa, Nanga Eboko, Bélabo |
| Physical characteristics | |
| Source | Confluence of Djérem River and Lom River[1] |
| • coordinates | 5.323772°N 13.397769°E |
| • elevation | 628 m (2,060 ft) |
| Mouth | Bight of Biafra |
• coordinates | 3.559338°N 9.652175°E |
• elevation | 0 m |
| Length | 603 km (375 mi), with Djérem River 1,067.5 km (663.3 mi) |
Basin size | 132,990 km2 (51,350 mi2) |
| Discharge | |
| • location | Edéa |
| • average | 1,985 m3/s (70,100 cu ft/s) |
| • minimum | 234 m3/s (8,300 cu ft/s) |
| • maximum | 6,950 m3/s (245,000 cu ft/s) |
| Discharge | |
| • location | Bight of Biafra, Cameroon (near mouth) |
| • average | 2,072 m3/s (73,200 cu ft/s)[2] |
| • minimum | 473 m3/s (16,700 cu ft/s)[2] |
| • maximum | 5,700 m3/s (200,000 cu ft/s)[2] |
| Basin features | |
| River system | Sanaga River |
| Tributaries | |
| • left | Long River, Tete River, Sele River, Mfam River, Ngoba River |
| • right | Mbam River, Mbuku River, Ligene River, Djam River, Dorong River, Jape River, Uem River |
| Waterbodies | Song Loulou Hydroelectric Power Station, Edea Hydroelectric Power Station |
| Bridges | Japoma Bridge |
Course
The Sanaga River has its source at the Adamawa Plateau.[3] 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 464.5 km (288.6 mi) and Lom River a total length of 424.2 km (263.6 mi). Apart from these originating rivers, the largest tributary of the Sanaga is Mbam River with a total length of 548 km (341 mi).[4]
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:[1]
View chart definition.
Dams and reservoirs
Beginning at the headwaters, there are 2 dams on the Sanaga River:
| Dam | Nameplate capacity (MW) |
Reservoir | Surface area (km2) |
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.[5]
Transport
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.[6][7]
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.[8][9]
Conservation efforts increasingly focus on balancing hydropower production with environmental flow management and the protection of aquatic biodiversity throughout the Sanaga basin.[10][11]
