Aargau, more formally the Canton of Aargau, is one of the 26 cantons forming the Swiss Confederation. It is composed of eleven districts and its capital is Aarau. Aargau is one of the most northerly cantons of Switzerland, by the lower course of the Aare River, which is why it is called Aar-gau. It is one of the most densely populated regions of Switzerland.
Country: Switzerland
Capital and largest city: Aarau
Subdivisions: 198 municipalities, 11 districts
ISO 3166 code: CH-AG
Highest point: 908 m (2,979 ft): Geissfluegrat
Lowest point: 260 m (853 ft): Rhine at Kaiseraugst