Les Baux-de-Provence (Occitan: Lei Bauç de Provença) is a French commune in the Bouches-du-Rhône department of the province of Provence in the Provence-Alpes-Côte d'Azur region of southern France. It has a spectacular position in the Alpilles mountains, set atop a rocky outcrop that is crowned with a ruined castle overlooking the plains to the south. Its name refers to its site: in Provençal, a bauç is a rocky spur. , The name bauxite (Aluminium ore) is derived from the village name when it was first discovered there by geologist Pierre Berthier in 1821.