Undoubtedly the most important viticultural region of the country of Argentina is Cuyo, the arid and red-soiled area within central-west Argentina which produces over eighty percent of the nation's wine each year. Cuyo represents the finest aspects of Argentinian wine making, with wineries in the region celebrating their traditions which stretch back to the sacramental wines first introduced to the country by Spanish settlers hundreds of years ago. As with much of Argentina, Cuyo is most famous for the production of Malbec wines, with Malbec grapes thriving prodigiously in the hot climate of the region, reaching full ripeness in ways they rarely could in their native France, and producing wines of exceptional flavor and quality. The Desaguadero River is the key water source in this otherwise dry and dusty region, and successful irrigation projects have helped bring water to even the driest vineyards within Cuyo. There are plenty of notable native Spanish grapes which have made a big impression on the wine world at large, but none are as renowned or as widely loved as the Tempranillo varietal. This black skinned grape has been used for wine making for centuries, with several ancient civilizations noticing the fact that it is highly versatile and holds some delicious flavors and aromas, perfect for those looking for a powerful yet elegant grape for their wines. Tempranillo often causes winemakers some trouble, however, as it is highly susceptible to many diseases. Despite this, plenty continue to persevere with this varietal, as it is perfect for producing delicious and complex single variety and blended wines, packed full of classic Spanish flavors and plenty of aromatic and intense surprises.