Normandy (from Old French Normanz, plural of Normant, originally from the word for "northman" in several Scandinavian languages) is the northwesternmost of the 18 regions of France, roughly coextensive with the historical Duchy of Normandy. Normandy is divided into five administrative departments: Calvados, Eure, Manche, Orne, and Seine-Maritime. It covers 30,627 square kilometres (11,825 sq mi), comprising roughly 5% of the territory of metropolitan France. Its population of 3,322,757 accounts for around 5% of the population of France. The inhabitants of Normandy are known as Normans, and the region is the historic homeland of the Norman language. The neighboring regions are Hauts-de-France and Ile-de-France to the east, Centre-Val de Loire to the southeast, Pays de la Loire to the south, and Brittany to the southwest. The capital is Rouen. The historical region of Normandy comprised the present-day region of Normandy, as well as small areas now part of the departments of Mayenne and Sarthe. The Channel Islands are also historically part of Normandy; they cover 194 km² and comprise two bailiwicks: Guernsey and Jersey, which are British Crown dependencies over which Queen Elizabeth II reigns as Duke of Normandy. Normandy's name comes from the settlement of the territory by mainly Danish and Norwegian Vikings ("Northmen") from the 9th century, and confirmed by treaty in the 10th century between King Charles III of France and the Viking jarl Rollo. For four hundred years following the Norman conquest of England in 1066, Normandy and England were linked by having the same person reign as both Duke of Normandy and King of England.