In the heart of the Hautes-Terres de Provence region, the Sasse valley is a long, wooded corridor that opens onto the agricultural environments of the valley floor and the gently rolling hillsides. It gives access to mountainous terroirs enclosed by large ridges and rocky massifs. The region’s geology is dominated by limestone, punctuated by sandstone and marl.

The Sasse is a left-bank tributary of the Durance, which rises in the commune of Selonnet, north of the Tête Grosse summit (2,032 m), at an altitude of 1,920 m. Sasse is a common name in the Alps, coming from the Latin saxum meaning rock.