The Hadejia River is a river in northern Nigeria

Nigeria

Nigeria , officially the Federal Republic of Nigeria, is a federal constitutional republic comprising 36 states and its Federal Capital Territory, Abuja. The country is located in West Africa and shares land borders with the Republic of Benin in the west, Chad and Cameroon in the east, and Niger in...

 and is a tributary of the Yobe River

Yobe River

The Yobe River is a river in West Africa that flows into Lake Chad through Nigeria and Niger.Its tributaries include the Hadejia River and the Jama'are River...

 (Komadugu Yobe).
Among the cities and towns that lie on or near its banks are Hadejia

Hadejia

Hadejia is a Hausa town in eastern Jigawa State, northern Nigeria. The population was approximately 47,400 . The people of Hadejia are largely Muslim, although some follow indigenous belief systems...

 and Nguru

Nguru, Nigeria

Nguru is a Local Government Area in Yobe State, Nigeria. Its headquarters are in the town of Nguru near the Hadejia River at .It has an area of 916 km² and a population of 150,632 at the 2006 census....

.
Damming of the river for the purposes of irrigation has led to a decrease in the amount of water in the Hadejia-Nguru wetlands

Hadejia-Nguru wetlands

thumb|right|300px|[[Yobe River]] catchment area showing location of the Hadejia-Nguru wetlandsThe Hadejia-Nguru wetlands in Yobe State in northern Nigeria, which include Nguru Lake, are ecologically and economically important...

, which the river forms along with Nguru Lake.
The Hadejia river is now 80% controlled by the Tiga

Tiga Dam

The Tiga Dam is in Kano State in the Northeast of Nigeria, constructed in 1971-1974. It is a major reservoir on the Kano River, the main tributary of the Hadejia River. Water from the dam supplies the Kano River Irrigation Project as well as Kano City...

 and Challawa Gorge

Challawa Gorge Dam

The Challawa Gorge Dam is in Kano State in the Northeast of Nigeria, about 90 km southwest of Kano city. It is a major reservoir on the Challawa River, a tributary of the Kano River, which is the main tributary of the Hadejia River.-Construction:...

 dams in Kano State

Kano State

Kano State is a state located in North-Western Nigeria. Created on May 27, 1967 from part of the Northern Region, Kano state borders Katsina State to the north-west, Jigawa State to the north-east, Bauchi State to the south-east and Kaduna State to the south-west...

.