Kirisia Hills Water Tower in Samburu County. The main rivers emanating from the water tower are the Olketuloni River to the North, Mureiyia, Elbukoi, Nundoto, and Pororo to the West as well as Seiya to the South. There are about 45 dry riverbeds in the area signifying the existence of many seasonal rivers. Samburu County boasts of 12.8% tree cover, which is fairly good compared to 30 counties that are below 10% tree cover.