Aquitaine (Occitan: Aquità nia; Basque: Akitania) (archaic "Guyenne", Guienne; in Occitan: Guiana) is one of the 26 regions of France, in the south-western part of metropolitan France, along the Atlantic Ocean an the Pyrenees mountain range on the border with Spain. In the Middle Ages it was a kingdom and later a duchy, with boundaries considerably larger than the modern ones.