Lake Ol’ Bolossat is the only lake in central Kenya. The lake forms the headwaters for the Ewaso Ng'iro River, which supports the livelihoods of communities, livestock and wildlife in the dry Laikipia, Samburu, Isiolo and Garissa Counties. Despite its small size (43.3km2) the freshwater lake is known for its rich biodiversity that include hippos and over 300 bird species (both residents and migrants). The lake lies within the central tourism circuit, and supplies Nyahururu town with water. The Ewaso Nyiro River supports the thriving wildlife tourism in Buffalo Springs, Shaba National Reserve, and Lorian swamp in Wajir, where the river goes underground, to re-emerge in Somalia where it joins the Jubba River.