Athi River is a town outside Nairobi, Kenya in the former Eastern Province. It is also known as Mavoko. The town hosts Mavoko Municipal Council and headquarters of Mavoko division which is part of the Machakos County. It has a total population of 137,211 (2009 census), and is relatively industrialised,with six cement factories located within its vicinity. These include Bamburi Cement, Mombasa Cement, East Africa Portland Cement Company, Savannah Cement, National Cement and Athi River Mining.