Aquitaine (UK: AK-wih-TAYN, US: AK-wit-ayn, French: [akitɛn] (listen); Occitan: Aquitània [akiˈtanjɔ]; Basque: Akitania; Poitevin-Saintongeais: Aguiéne), archaic Guyenne or Guienne (Occitan: Guiana), is a historical region of southwestern France and a former administrative region of the country. Since 1 January 2016 it has been part of the region of Nouvelle-Aquitaine. It is situated in the southwest corner of Metropolitan France, along the Atlantic Ocean and the Pyrenees mountain range on the border with Spain, and for most of its written history Bordeaux has been a vital port and administrative center. It is composed of the five departments of Dordogne, Lot-et-Garonne, Pyrénées-Atlantiques, Landes and Gironde. Gallia Aquitania was established by the Romans in ancient times and in the Middle Ages, Aquitaine was a kingdom and a duchy, whose boundaries fluctuated considerably.