Château Langoa Barton is a winery and vineyard in the Saint-Julien appelation of the Médoc. In the official 1855 Bordeaux classification it was ranked as a third growth. There are 17 hectares (42 acres) of vines altogether, composed of 57 percent Cabernet Sauvignon, with 34 percent Merlot and 9 percent Cabernet Franc. These proportions are quite different to that of Léoville Barton, although the gravel over clay soils are similar, and viticultural methods are identical, employing traditional plowing. The grapes are hand-harvested and fermented on a plot-by-plot basis in thermo-regulated wooden vats. The grand vin is aged in French oak barrels, with up to 70 percent new oak depending on the vintage.