|Native name||Osimiri Ọmambala|
|Local Government Areas||Anambra East, Anambra West, Ayamelum|
|Onịcha, Onịcha úgwú, Anambra State|
|Length||256 km (159 mi)|
|Basin size||2,751 sq mi (7,130 km2)|
The Ọmambala River flows 210 kilometres (130 mi) into the Niger River and is found in Anambra, Nigeria. The river is the most important feeder of the River Niger below Lokoja. The flow of the Ọmambala River is released into the Atlantic through various outlets forming the 25,000-square-kilometre (9,700 sq mi) Niger Delta region.
- Anyadike, Raymond N. C.; Phil-Eze, Phillip O. (1989). "Runoff Response to Basin Parameters in Southeastern Nigeria". Geografiska Annaler. Series A, Physical Geography. Blackwell Publishing. 71 (1–2): 75. JSTOR 521009.
- Shahin, Mamdouh (2002). Hydrology and water resources of Africa. Springer. pp. 307–309. ISBN 1-4020-0866-X.
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