are: Auch, the historical capital Bayonne, with both Basque and Gascon identity Bordeaux, crossed by the Garonne Dax Lourdes Luchon Mont-de-Marsan Pau, with both Bearnese and Gascon identity Tarbes Bayonne, Dax and Tarbes are crossed by the Adour. Pau and Lourdes are crossed by the Gave de Pau. Mont-de-Marsan also belongs to the drainage basin of the Adour. The Gers (river), a tributary of the Garonne, flows through Auch. References States and territories established in the 1st millennium Former provinces of France Basque history History of Nouvelle-Aquitaine History of Occitania (administrative region) Gascony