Pyrénées-Atlantiques is a department located in the region of Nouvelle-Aquitaine in the southwest corner of metropolitan France. Named aft…Pyrénées-Atlantiques is a department located in the region of Nouvelle-Aquitaine in the southwest corner of metropolitan France. Named after the Pyrenees mountain range and the Atlantic Ocean, it covers the French Basque Country and the Béarn. It is divided in three arrondissements and its prefecture is Pau. In 2019, it had a population of 682,621.