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. One of the most widely grown and easily recognized wine grape varietals in the world is the Muscat, an ancient grape with an exceptional amount of versatility. For centuries, Muscat varietal grapes have been used all over Europe for the production of wonderfully fruity wines of many different shades and colors, which, with their strong 'grapey' flavor have come to be known as a quintessential fine wine grape. Their relatively high acidity also means they are ideal for the production of sparkling wines, and the fizzy Muscat wines of Italy are widely agreed to be amongst the best in the world. In more recent years, New World countries have shown a huge amount of flair when it comes to the Muscat grape, and have had plenty of success in allowing its natural and vibrant character to come through in the bottle.