Le Castellet, Alpes-de-Haute-ProvenceLe Castellet is a rural commune in the Alpes-de-Haute-Provence department in the Provence-Alpes-Côte d'Azur region in Southeastern France. It is located north of Valensole, east of the Valley of the Durance.WWW le-castellet.frGeographyThe river Asse forms part of the commune's southern border.