KIKUYU TOWN: Ondiri Wetlands, located just 200 meters south of Kikuyu town and 20 km west of Nairobi’s Central Business District, is not only a natural peat bog but also a vital water source for the region. Covering approximately 34.5 hectares, this wetland is Kenya’s largest natural peat bog with water depths reaching 3-4 meters. It significantly contributes to the local water supply and ecological diversity.
According to Kenya News Agency, the wetland is a crucial ecological area with a profound historical and environmental significance. Originally named “Old Lake” by colonial settlers, Ondiri Wetlands has been a primary source of water for Nairobi City, thanks to the Nyongara River that originates from it. The river is a vital tributary of the Nairobi River and has historically been used to provide piped water to the city.
The Friends of Ondiri Wetland Kenya (FOWK), established in 2016 due to the deteriorating conditions of the bog, have since spearheaded restoration efforts. These include tree planting,
community events, and educational campaigns aimed at preserving this geographical marvel. David Wachoge, the Chief Coordinator of FOWK, emphasized the wetland’s role in recharging the Kikuyu springs through an underground passage, which ensures a continuous supply of water to the surrounding areas.
Wachoge also highlighted the creation of Rungiri Dam, a consequence of rock mining activities by an Italian contractor during the construction of the Nakuru-Nairobi highway. This dam now serves as a crucial reservoir, further supporting the water levels at Ondiri Wetlands.
Local fears of the wetland drying up have been addressed by Wachoge, who reassured that the main threat is eutrophication rather than a decrease in water input. The wetland’s water has been essential for various local projects and institutions, including the prestigious Alliance High School, which has utilized this water source since 1926.
The school, along with other local entities like the National Defense College and Kiambu Conservatoire of
Forests, has been actively involved in conservation efforts, particularly highlighted during the recent Mazingira Day celebrations where over 4000 tree seedlings were planted.
The wetland, home to over 68 plant species and 94 species of birds, including the endangered grey-crowned crane, plays a vital role in biodiversity conservation. It has also become a popular eco-tourism destination, offering visitors a chance to explore its untouched natural beauty.
Despite challenges such as encroachment and pollution, efforts are ongoing to protect and sustainably manage Ondiri Wetlands. With the support of the Kiambu Government and various stakeholders, a management plan has been put in place to preserve its ecological, social, and economic values.
