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Location Kenya, Rift Valley Province
Central coordinates 36o 21.00' East  0o 46.00' South
IBA criteria A1, A2, A4i, A4iii
Area 23,600 ha
Altitude 1,890 m
Year of IBA assessment 2001

NatureKenya



Site description This site lies on the floor of the Rift Valley, 80 km north-west of Nairobi, and consists of a shallow freshwater lake (15,600 ha) and its fringing Acacia woodland (c.7,000 ha). Lake Naivasha is of recent geological origin, and is ringed by extinct or dormant volcanoes, including Mounts Longonot, Ol Karia and Eburu. Naivasha’s water is supplied by the permanent Malewa and Gilgil rivers, which respectively drain the Aberdare mountains (IBA KE001) and the Rift Valley floor to the north, by the seasonal Karati river (also draining from the Aberdares) and from substantial ground-water seepage. The Malewa covers 1,730 km2 of the 2,800 km2 catchment, and contributes 90% of the surface water entering the lake. Naivasha has no surface outlet. It is thought that a combination of underground outflow and sedimentation of salts keeps the lake fresh, unlike other endorheic lakes in the eastern Rift Valley. Naivasha includes three chemically distinct water bodies. The main lake (c.15,000 ha, maximum depth c.8 m) incorporates a partially submerged crater, the Crescent Island lagoon (maximum depth c.18 m), at its eastern end. The lagoon is largely isolated at low water levels. To the south-east, separated by papyrus Cyperus papyrus swamp and an isthmus of Acacia woodland, is the small (c.550 ha), somewhat alkaline Lake Oloidien. Papyrus fringes the main lake’s shore (with scatterings of other sedges and Typha) and cloaks the inlets of the Gilgil and Malewa rivers. There are large floating, wind-driven rafts of the exotic water-hyacinth Eichhornia crassipes, usually concentrated in the south-west sector. Submerged macrophytes (including Potamogeton spp. and Naja pectinata) sometimes occur in large beds, mainly in the shallow eastern part, but these vary greatly in extent. The shores of Crescent Island lagoon are steep and rocky or flat and muddy, while Oloidien has an open, grassy shoreline, with no emergent or floating macrophytes. The lake’s levels fluctuate enormously, and Naivasha has been dry within historic times. The surrounding riparian land is almost all privately owned, much of it now used for intensive horticulture and floriculture using water from the lake. A belt of tall Acacia xanthophloea woodland fringes the lake and extends along the rivers to the north, though portions have been cleared for farming; further from the water this gives way to dry open grassland, Tarchonanthus camphoratus scrub and (on rocky hillsides) Euphorbia forest. Naivasha is the second site listed by Kenya as a Wetland of International Importance under the Ramsar Convention.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Little Grebe Tachybaptus ruficollis winter  1997  1,500 individuals  A4i  Least Concern 
African Spoonbill Platalea alba winter  1997  412 individuals  A4i  Least Concern 
Red-knobbed Coot Fulica cristata winter  1991  19,400 individuals  A4i  Least Concern 
Grey-crested Helmet-shrike Prionops poliolophus resident  1999  present  A1, A2  Near Threatened 
Basra Reed-warbler Acrocephalus griseldis winter  present  A1  Endangered 
A4iii Species group - waterbirds winter  20,000 individuals  unknown  A4iii   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Lake Naivasha Wetlands of International Importance (Ramsar) 30,000 protected area contains site 23,600  

Local conservation groups The local conservation group below is working to support conservation at this IBA.

Name Year formed
Lake Naivasha Nature Club 16

Habitats

IUCN habitat Habitat detail Extent (% of site)
Forest Woodland - monodominant  -
Wetlands (inland) Freshwater lakes and pools  70%

Land use

Land-use Extent (% of site)
fisheries/aquaculture -
agriculture -
tourism/recreation -

Other biodiversity The lake supports a large and expanding population of Hippopotamus amphibius (c.300 individuals at present). The snake Bitis worthingtonii, endemic to the central Rift Valley above 1,500 m, is recorded from Naivasha.

References Bennun (1992a, 1993), Bennun and Nasirwa (2000), Burgis and Mavuti (1987), Harper (1984, 1987, 1992), Harper and Mavuti (1996), Harper et al. (1990, 1993, 1995), Henderson and Harper (1992), Higgins (1994), Lewis (1983), Nasirwa (1998), Nasirwa and Bennun (1994, 1995), Nasirwa and Owino (2000), Owino and Nasirwa (2001), Owino et al. (in press), Oyugi and Owino (1998a,b, 1999), Spawls (1978), Tarras-Wahlberg (1986), Tyler (1991), Virani et al. (1997).

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Lake Naivasha. Downloaded from http://www.birdlife.org on 28/08/2014

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