Chateau Cos d'Estournel is a Grand Cru vineyard located in St. Estephe. Its oriental facade is adorned with three pagoda turrets, all cast in a soft golden sandstone. Chateau Cos d'Estournel today covers 170 acres separated from Chateau Lafite, along the southern edge, by the stream between St. Estephe and Pauillac. The gravelly soil, over a flint, limestone and silicate subsoil low in nitrogen, has eroded over centuries to form steep ridges which perfectly drain the vineyards. The vineyards are planted 60 percent in Cabernet Sauvignon vines, 2 percent of Cabernet Franc, and 38 percent in Merlot. Naturally, the percentage of Cabernet or Merlot in the composition of each vintage depends on the climate which favors one grape variety or the other.