Argentine winemakers have long held the belief that vines required hot and arid climates with large temperature variations to produce quality wines. This 'winning formula' led to a concentration of wineries in Mendoza, San Juan and La Rioja provinces in the west, as well as higher-altitude vineyards in Salta. More recently, there has been a shift towards slightly cooler and equally arid climates further south, in Neuquen and Rio Negro.