The territorial organization of Serbia is regulated by the Law on Territorial Organization, adopted by the National Assembly of Serbia on 29 December 2007. Under the Law, the units of the territorial organization are: municipalities, cities and autonomous provinces.
The 46-day Lenten fast for Serbians and other Orthodox Christians is strict. Western Christians, for whom Sundays are exempt, fast for 40 days unlike Orthodox Christians who also fast on the six Sundays in Lent.
Danube and Morava rivers are the largest in the country and constitute its main river axes.