The Dentelles de Montmirail extend west of the Monts de Vaucluse and at the southwest end of the Baronnies. Their location on the edge of the Rhône valley exposed them to intense erosion that explains their jagged shape, further accentuated by the heterogeneity of the sedimentary deposits (thick limestone banks to the north, faults and vertical limestone slabs to the south) that constitute them. The Dentelles de Montmirail follow the east-west orientation of the Pyrenean-Provençal folding. They are delimited to the northeast by the crest of Saint-Amand, to the northwest by the Ouvèze plain, to the south by that of the Comtat Venaissin, and to the east by the fault that separates them from the foothills of the Mont Ventoux.