Uco Valley is highly recognized for its higher-altitude location at the foot of the Andes Mountains; the valley's La Consulta, Tupungato and Tunuyan sub-regions sit at altitudes from 2,800 ft (850m) and 3,600 ft (1,100m) respectively. Located at latitude of 33 degrees south, the area's elevated vineyards benefit from high daytime temperatures, which drop very cool at night. The altitude brings clarity of light, water and air, and moderates the high temperatures associated with lower latitudes. This allows the grapes to produce balanced sugars and acidity while achieving phenolic ripeness. In addition to its high quality Red wine, some of Mendoza's finest white wines come from Uco Valley vineyards, as the relatively cool climate allows the requisite slower ripening period. The valley follows the northerly course of the Tunuyan River as it flows down from its source high up in the Andean peaks. The terrain in the area is largely alluvial - a clay and rock base with a stony, sandy surface - ideal for viticulture as it allows for good drainage, and forces the vines to grow deep, strong roots. This is crucial to the area as dry continental climate brings little rain, so flood irrigation techniques are widely used.