In the Uco Valley, south of Mendoza city in western Argentina. The soil here is alluvial, well-drained sandy silt balanced with high levels of limestone. A shallow top soil keeps the roots of the vines fresh, then the underlying chalk and stones limit growth, adding complexity as the roots drive deep to extract the minerals characteristic of this region. The vineyard lies on the bank of the Tunuyán river at the foot of the Andes and enjoys a diurnal temperature variation ( + 15 C), offering hot summers with cold nights that allow the grapes to mature slowly, producing a high concen- tration of tannins and excellent acidity for wines that age well.