departmental seat of government is known as the prefecture () or and is generally a town of some importance roughly at the geographical centre of the department. This was determined according to the time taken to travel on horseback from the periphery of the department. The goal was for the prefecture to be accessible on horseback from any town in the department within 24 hours. The prefecture is not necessarily the largest city in the department: for instance, in Saône-et-Loire department the capital is Mâcon, but the largest city is Chalon-sur-Saône. Departments may be divided into . The capital of an arrondissement is called a subprefecture () or . Each department is administered by a departmental council (), an assembly elected for six years by universal suffrage, with the President of the Departmental Council as executive of the department. Before 1982, the chief executive of the department was the prefect (), who represents the Government of France in each department and is appointed by the President of the French Republic. The prefect is assisted by one or more sub-prefects () based in the subprefectures of the department. Since 1982, the prefect retains only the powers that are not delegated to the department councils. In practice, their role has been largely limited to preventing local policy from conflicting with national policy. The departments are further divided into communes, governed by municipal councils. As of 2013, there were 36,681 communes in France. In the overseas territories, some communes play a role at departmental level. Paris, the country's capital city, is a commune as well as a department. In continental France (metropolitan France, excluding Corsica), the median land area of a department is , which is two-and-a-half times the median land area of the ceremonial counties of England and the preserved counties of Wales and slightly more than three-and-half times the median land area of a county of the United States. At the 2001 census, the median population of a department in continental France was 511,000 inhabitants, which is 21 times the median population of a United States county, but less than two-thirds of the median population of a ceremonial county of England and Wales. Most of the departments have an area of between 4,000 and 8,000 km2 (1500 to 3000 sq. mi.), and a population between 320,000 and 1 million. The largest in area is Gironde (10,000 km2; 4000 sq. mi.), while