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. Semillon was, at one point not so long ago, widely believed to be one of the most grown grape varietals in the world. Whilst today the numbers of Semillon grapes has dropped considerably, it remains a widely planted grape with vineyards all over Europe and the New World dedicated to making the most of this special and flavorful varietal. The grapes are recognizable by their golden color, and the fact that they can take on a pinkish hue in particularly warm climates. The wines the Semillon grape produces are notably varied, and are often very crisp and dry, or sweet and soft, full of a wide range of flavors Commonly, dry Semillon wines are particularly citrus in flavor, with a delicate and summery bouquet. The vine is hardy and vigorous, and notable for being easy to grow and produce high yields from.