Serbia is a unitary state composed of municipalities/cities, districts, and two autonomous provinces. In Serbia, excluding Kosovo, there are 145 municipalities (''opštine'') and 29 cities (''gradovi''), which form the basic units of local self-government. Apart from municipalities/cities, there are 24 districts (''okruzi'', 10 most populated listed below), with the City of Belgrade constituting an additional district. Except for Belgrade, which has an elected local government, districts are regional centres of state authority, but have no powers of their own; they present purely administrative divisions.