he meaning of the word “Terroir” includes several elements such as soil, climate, topology and geology. In this respect the " terroir" of Saint-Julien is acknowledged as one of the best in the world for wine production. Langoa and Léoville Barton are situated in the heart of this prestigious appellation. the 45 hectares of Léoville and 15 hectares of Langoa are planted on this gravel soil with clay sub-soil and include a large proportion of old vines which produce the best quality. The grape varieties are represented by 72% Cabernet Sauvignon, 20% Merlot and 8% Cabernet Franc in both vineyards ; the methods of vinification are also the same. The gravel soil is found on top of a clay sub-soil. The depth at which this clay is found and the presence of other elements in the soil is variable from one part of the vineyard to another. This variation makes it difficult to define their influence on the two vineyards.