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Location Kenya, Rift Valley Province
Central coordinates 36o 7.08' East  0o 15.24' North
IBA criteria A1, A4i, A4iii
Area 15,000 ha
Altitude 1,000 - 1,600m
Year of IBA assessment 2001

NatureKenya



Site description Bogoria is a narrow, shallow, alkaline lake on the Rift Valley floor, varying from 3,000 to 4,250 ha in extent, with a maximum depth of 8.5 m. To the east, the Siracho escarpment rises abruptly from the lakeshore, while on the relatively flat western shore is a series of spectacular hot springs and geysers. The reserve was gazetted in 1981 and includes the entire lake and its immediate surroundings. The water usually supports a dense bloom of the cyanophyte Spirulina sp. The terrestrial vegetation is mainly thorny bushland, dominated by species of Acacia, Balanites and Commiphora, with patches of riverine woodland containing Ficus capensis, Acacia xanthophloea and A. tortilis. The open shore, often littered with lava boulders, is dominated by alkaline-tolerant grasslands of Sporobolus spicatus, with the sedge Cyperus laevigatus around the hot springs. The lower slopes of the Siracho escarpment are covered by Combretum and Grewia thicket. The lake is fed by its springs and by the Sandai (or Waseges) river, which rises on the eastern scarp of the Rift Valley. The Sandai flows past the lake and then turns through 180° to enter it from the north through the Kisibor swamp, a sizeable freshwater wetland dominated by Typha.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Black-necked Grebe Podiceps nigricollis winter  1997  3,700 individuals  A4i  Least Concern 
Greater Flamingo Phoenicopterus roseus winter  2001  18,540 individuals  A4i  Least Concern 
Lesser Flamingo Phoeniconaias minor winter  1999  1,070,000 individuals  A1, A4i  Near Threatened 
A4iii Species group - waterbirds winter  1,000,000-2,499,999 individuals  unknown  A4iii   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Lake Bogoria National Reserve 10,705 is identical to site 10,700  
Lake Bogoria Wetlands of International Importance (Ramsar) 10,700 is identical to site 10,700  

Habitats

IUCN habitat Habitat detail Extent (% of site)
Grassland Grassland - edaphic, wet  -
Savanna Bushland & thicket - evergreen  -
Wetlands (inland) Saline lakes  40%

Land use

Land-use Extent (% of site)
tourism/recreation -
nature conservation and research -
agriculture -

Other biodiversity The hot springs contain a highly specialized microbial fauna, with several endemic species.

References Bennun (1993), Bennun and Nasirwa (2000), Brown (1973), Burgis and Mavuti (1987), Hartley (1986), Nasirwa and Bennun (1994, 1995), Nasirwa and Owino (2000), Njuguna (1996), Owino and Nasirwa (2001), Owino et al. (in press), Oyugi (1994), Oyugi and Owino (1998a,b, 1999), Tuite (1979, 1981).

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Lake Bogoria National Reserve. Downloaded from http://www.birdlife.org on 22/08/2014

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