Vistalba is a small wine-producing sub-region in the west of Mendoza, Argentina. Its terrain is slightly more elevated than the wine-growing areas to the east, sitting at an altitude of more than 3300ft (1000m). As in much of the Mendoza region, the soil in Vistalba is alluvial, with sandy topsoil over a stone- and clay-dominated base. This composition is excellent for quality driven viticulture, providing excellent drainage. The high diurnal temperature variation is also a critical factor in Vistalba's production of fine Malbec grapes.