Aquitaine (French pronunciation: [a.ki.tɛn], English /ˌækwɪˈteɪn/; Occitan: Aquitània; Basque: Akitania), archaic Guyenne/Guienne (Occitan: Guiana), is one of the 27 regions of France, in the south-western part of metropolitan France, along the Atlantic Ocean and the Pyrenees mountain range on the border with Spain. It is composed of the 5 departments of Dordogne, Lot et Garonne, Pyrénées-Atlantiques, Landes and Gironde. In the Middle Ages Aquitaine was a kingdom and a duchy, whose boundaries fluctuated considerably.