Briançon

City, Hautes-Alpes département, Provence-Alpes-Côte-d'Azur région, southeastern France. Briançon lies at the confluence of the Durance and Guisanne rivers. Its location at a crossing point for commerce across the Alps made the city important historically. The upper city preserves 17th-century fortifications designed by Sébastien Le Prestre de Vauban; the lower city