sentences:  The Médoc is itself divided into Haut-Médoc (the upstream or southern portion) and Bas-Médoc (the downstream or northern portion, often referred to simply as "Médoc").There are various sub-regions within the Haut-Médoc, including St-Estèphe, Pauillac, St.-Julien and Margaux and the less well known areas of AOC Moulis and Listrac.Graves includes the sub-regions of Pessac-Léognan and Sauternes (among others), and Sauternes in turn includes the sub-region of Barsac.