[1] Baden is named after the margraves' residence, Hohenbaden Castle in Baden-Baden.
Baden lies in the southwest of Germany, with most of its major cities on the Upper Rhine Plain.
Bounded by Lake Constance on the south and by the river Rhine on the south and west, the region of Baden stretches from the Linzgau, Lörrach and Freiburg im Breisgau to Karlsruhe and then on to Mannheim, leading to the Main and Tauber rivers.
To its west lies the French historical region of Alsace, to its south Switzerland, the Palatinate to its northwest, Hesse to the north, and parts of Bavaria to the northeast.
Its eastern border with the region of Württemberg runs from the Kraichgau through the Black Forest, and from some parts of the forest to the Rhine the distances become as low as 18 kilometres (11 mi) in the so-called "Wespentaille" near Gaggenau.