The Lake Victoria Basin, the Highlands West of the Rift Valley and the Central and South Rift Valley (Siaya, Kisumu, Homabay, Migori, Kisii, Nyamira, Transnzoia, Baringo, Uasin Gishu, Elgeyo-Marakwet, Nandi, Nakuru, Narok, Kericho, Bomet, Kakamega, Vihiga, Bungoma and Busia Counties)