Bayonne (; Gascon: Baiona ; ; ) is a city and commune and one of the two sub-prefectures of the department of Pyrénées-Atlantiques, in the Aquitaine region of south-western France. It is located at the confluence of the Nive and Adour rivers in the northern part of the cultural region of Basque Country as well as the southern part of Gascony where the Aquitaine basin joins the beginning of the Pre-Pyrenees.