Potensac is a Cru Bourgeois, located in the appellation of Médoc.
With the exception of Haut Brion, all the Chateaux listed in the 1855 classification are situated in the Medoc, however, as with the Haut Medoc, most of the grand names defer to their more specific appellations. This is a vast AOC with around 1500 different wine-making estates. There are many good AOC Medoc wines, which did belong to the now defunct Cru Bourgois classification. The most notable estate is Potensac, which is owned by Leoville Las Cases.