Fontaine-de-Vaucluse is a small Luberon town in Provence France. It is most famous for being the town where the source of the Sorgue River is located, which gives the town its name. The main reason it is a tourist attraction is that the spring happens to be located in an enclosed valley at the mouth of a cave, surrounded by high cliffs with a ruined castle located high above, making it quite a picturesque site.