The Nairobi River is a river that flows across Nairobi, the capital city of Kenya. It is the main river of the Nairobi River Basin, with several parallel streams flowing eastward. All of the Nairobi basin rivers join east of Nairobi and meet the Athi River, which eventually flows into the Indian Ocean. The rivers are mostly narrow and highly polluted, though recent efforts to clean the rivers have improved water quality.
The main stream, the Nairobi River, bounds the northern city center, where it is partly canalized.
- Athi River
- Gathara-ini River
- Gitathuru River
- Kiu River
- Mathari River
- Mbagathi River
- Nairobi River
- Ngong River
- RuiRuaka River
Gatharaini stream originates in the marshes of the lower reaches of the Aberdare mountains and flows through various populated areas. The stream is impacted by human activities along its channels and in its catchment. In the upper sections of Kiambaa and Kanunga, the stream passes through swampy and marshy areas, with subsistence agriculture and human settlement as the main types of land use. In the midsections of Kiambu, are extensive coffee crops and mixed farming.
In Eastern Nairobi it passes through Nairobi Sewerage Company in Ngundu,Kamulu
In the lower sections of Githurai and Zimmerman, the stream is characterized by coffee farming, intensive mixed farming, and industry such as the Kamiti Tannery Factory. The lower stream waters are brackish and foul. In the past, riverine subsistence agriculture of arrowroots and kale was common throughout the area. Efforts to conserve and preserve this river are yet to be initiated.
- Ndiritu, G. G., N. N. Gichuki, P. Kaur, and L. Triest. 2003. The Nairobi river is mainly used by local citizens for bathing, washing clothes, and cleaning their homes. Characterization of environmental gradients using physicochemical measurements and diatom densities in Nairobi River, Kenya. Aquatic Ecosystem Health & Management, 6 (3): 343-354.
- "Nairobi River Basin" (PDF). Archived from the original (PDF) on 2016-03-04. Retrieved 2015-05-13.
- Obura, Fredrick. "Increased human activities threaten source of Nairobi River - Smart Harvest". www.farmers.co.ke. Retrieved 2020-05-29.
- Galimo Askumo (27 May 2017). "A Guide to Nairobi's Rivers and Streams".
- Ndaruga, A. M., G. G. Ndiritu, N. N. Gichuki and W. N. Wamicha.N. 2004. The impact of water quality changes on riverine macroinvertebrate assemblages along a tropical stream, Kenya. African Journal of Ecology 42: 208-216
- Biosafety News, October/November 2002
- Ndiritu, G. G., N. N. Gichuki and L. Triest. 2006. Distribution of epilithic diatoms in response to environmental conditions in an urban tropical stream, Central Kenya. Biodiversity and conservation 15:3267-3293
- Rough Guide Map Kenya (Map) (9 ed.). 1:900,000. Rough Guide Map. Cartography by World Mapping Project. Rough Guide. 2006. ISBN 1-84353-359-6.