Kenya is divided into seven provinces: Coast, Northeastern, Eastern, Central, Rift Valley, Nyanza, and Western. (The Nairobi area is separate and has special status.) These are subdivided into 63 districts, each headed by a presidentially appointed commissioner; provincial administration is closely supervised by the central government. There are two types of upper local authorities (municipalities and county councils) and four types of lower authorities (urban councils, township authorities, area councils, and local councils). The Nairobi area, administered by a city council, is the direct responsibility of the central government. Many of the councils raise their own revenues by taxes, construct and maintain roads, carry out public health schemes, construct and improve housing, support education, and provide agricultural and social welfare services.