Barsac is one of the communes of the Sauternes appellation (along with Bommes, Fargues, Preignac and Sauternes itself). With marginally flatter land and soils of red sand and light gravels, the commune adjoins the northern boundary of the commune of Sauternes, separated by the Ciron River, whose cold waters are so instrumental in producing the region's necessary autumn fogs.

There are just over 800 hectares under vine, producing nearly two million bottles in an average year. The châteaux can choose to sell their wine under either the Sauternes or the Barsac appellation, but stylistically the wines are arguably a little lighter in style than those of Sauternes.