The Donga River is a river in Nigeria and Cameroon. The river arises from the Mambilla Plateau in Eastern Nigeria, forms part of the international border between Nigeria and Cameroon, and flows northwest to eventually merge with the Benue River in Nigeria. The Donga watershed is 20,000 km2 in area. At its peak, near the Benue the river delivers 1,800 m3 of water per second. In Taraba State, Nigeria, there are three forest reserves, Baissa, Amboi and Bissaula River, in the Donga river basin. They lie on the slopes and at the foot of the Mambilla Plateau, south-west of Gashaka Gumti National Park.

Pollution

Research reveals that pesticides were the predominant organic pollutant in the Donga river.

Climate

The annual average temperature is around 33°C but high level of cold in January and an increased rainfall in August. Rainfal percentage is 40.35% with 54.98% relative humidity. It is usually very warm in March with 40.44°C, and an average wind of 8.84km/h.