A fresh lively Bordeaux blanc produced from Sauvignon and Semillon, the first vintage of Chateau Cos dEstournel Blanc was made 2005. The grapes are grown north of St. Estèphe, in the Jau-Dignac and Loirac regions. The terroir is a mix of sand, clay, small stones and limestone. The wine is fermented and aged in mostly one-year-old barrels to maintain maximum freshness. Made in small volumes.

Since 1984 Château Rieussec has been the Sauternes property of the Rothschild family, owners of Chateau Lafite. Rieussec, a neighbour of Chateau dYquem, had for generations been a leading producer and was ranked Premier Cru in 1855. Even so, under Rothschild ownership the property has been transformed, with new cellars and winery and far more rigorous grape selection (plus greater use of barrel fermentation and maturation) for the flagship Grand Vin. This has led to Rieussecs clear emergence as a rival to its famous neighbour. Chateau Rieussec is 90% Semillon, with minor contributions from Sauvignon Blanc and Muscadelle. The property is 110ha with 68ha under vine.