The vines of the Roques de Cana domain are planted on clay-limestone and ferruginous soil, on the hillsides 18 km west of Cahors. The predominant south facing direction of the 39 hectares (approx. 103 acres) ensures optimal sunshine. Unlike the vines located on the 3rd terraces, the terroir of the limestone plateau of saint Vincent Rives d’Olt is reputed to add subtlety, fruitiness and minerality to the beverage, when the yield is low (between 20 and 30 hectolitres per ha, less than 3000 litres per 70 acres). 100% of the Graal Sanctus is produced from quality vines located on a terroir (i.e. 7ha, or 15acres) classified as future Grand Cru by the UIVC (Union Interprofessionnelle des Vins de Cahors).