Barsac is a small appellation within the Sauternes region of Bordeaux, France, known for producing lusciously sweet white wines made primarily from Sémillon, with Sauvignon Blanc and Muscadelle. Benefiting from morning fogs that encourage Botrytis cinerea (noble rot), Barsac wines are rich and honeyed, yet often lighter and more elegant than those from neighboring Sauternes. Notable producers include Château Climens and Château Doisy-Daëne, both known for their age-worthy, complex dessert wines.