From Nantes by the A83 exit 8 and then always follow Faymoreau (the place called La Doit is located on the D3 route de Faymoreau)
From Bordeaux by the A10 then the A83, exit 9 and then follow Saint Hilaire des Loges, then Faymoreau (the place called La Doit is located on the D3 route de Faymoreau)