|Location||Kenya, Central Province|
|Central coordinates||36o 25.62' East 0o 6.48' South|
|IBA criteria||A1, A2, A3|
|Altitude||2,340 - 2,400m|
|Year of IBA assessment||2007|
Site description Lake Ol' Bolossat, Central Province's only natural lake, is an internal drainage basin whose swamps have a high salt content possibly due to high evaporation rates and partly to the nature of sediments that constitute the area (Krhoda 1992). The lake is situated in the valley between the northwestern slopes of Aberdares Mountains and Dundori Ridge which are the main catchments. The altitude ranges from 2,340 - 2,400 meters above sea level, receiving an average precipitation of 975 - 1,100 mm pa. The Lake covers an area of 43.3 sq.km. of which open water covers about 4 sq.km. This drainage basin, Ewaso Ngiro North Basin covering 210,226 sq.km., is Kenya's largest. It offers a variety of habitats ranging from open water through floating marsh and swamps, open grasslands and riverine forests along rivers and springs that feed the lake.
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Maccoa Duck Oxyura maccoa||resident||2007-2010||present individuals||good||Near Threatened|
|Grey Crowned-crane Balearica regulorum||resident||2007||present individuals||good||Endangered|
|Jackson's Widowbird Euplectes jacksoni||resident||2007||present individuals||good||A2, A3||Near Threatened|
|Sharpe's Longclaw Macronyx sharpei||resident||2007||present individuals||good||A1, A2, A3||Endangered|
Local conservation groups The local conservation group below is working to support conservation at this IBA.
|Nyahururu Bird Club||2008|
|IUCN habitat||Habitat detail||Extent (% of site)|
|Wetlands (inland)||Freshwater lakes and pools||9%|
|Grassland||Grassland - montane||91%|
Land ownership Unprotected.
|Land-use||Extent (% of site)|
|Notes: Small and large-scale intensive agriculture.|
|Notes: Farm woodlots|
|nature conservation and research||15%|
|Notes: Wildlife conservation|
Other biodiversity Hippopotamuses, estimated at over 200 individuals, which graze overnight.
Acknowledgements The British Ornithologists’ Union (BOU) for providing funds for research. The Wetlands Programme and Office of the Deputy Director Biodiversity Research & Monitoring at Kenya Wildlife Service headquarters. The Chairman, Lake Ol Bolossat Conservation Network, Mr. Joseph Mbugua, for logistics. Field assistants and community local guides Teresia Maina and Paul Ndegwa, and Catherine Wambui of Kenya Forest Service based at South Marmanet Forest, for their field work facilitation
References Survey of globally-threatened birds at Lake Ol Bolossat Grasslands, central Kenya by Wanyoike Wamiti,Philista Malaki & Andrew Mwangi.Research Reports of the Directorate of Research & Collections, National Museums of Kenya: Ornithology, 78 (2007)
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Recommended citation BirdLife International (2014) Important Bird Areas factsheet: Lake Ol' Bolossat. Downloaded from http://www.birdlife.org on 11/03/2014
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