San Patricio del Chañar lies in Neuquén Province, in the eastern part of Patagonia along the Neuquén River valley. This area is part of Patagonia’s wine belt, where irrigation and a continental climate support vineyards, distinct from Mendoza’s Cuyo region and from the other provinces listed. Because the valley is geographically and administratively within Neuquén, that province is the correct location.

In Argentina, the deeply colored, fruit-forward Malbec most often comes from Mendoza, especially the Uco Valley. The high altitude here—vineyards often sit above a thousand meters—means plenty of sun and strong daytime warmth, which thickens grape skins and boosts pigment, giving wines a dark, inky color. The cool nights and diurnal temperature swings help preserve bright acidity and prevent overripe flavors, so the fruit-forward character stays lively and pronounced. The result is wines with bold blackberry and plum flavors, smooth tannins, and a plush mouthfeel, typical of Malbec from this area. Other regions listed can produce Malbec, but their wines aren’t as consistently known for that intense color combined with overt fruit-forwardness as Mendoza’s Uco Valley.

In Argentina, the red grape lineup used most widely includes Malbec as the flagship, with Bonarda playing a major role alongside it. Bonarda is a well-established, widely planted variety in the country, often used in blends with Malbec or bottled as a varietal wine, and it appears frequently in discussions of Argentina’s common red varieties. That substantial presence in vineyards and in commercial wines is why Bonarda is considered one of the eight major red grape varieties found there. Sangiovese is primarily Italian in origin, and while some plantings exist, it isn’t counted among Argentina’s standard eight major red varieties. Pinot Noir is grown in certain regions but typically not as prominent as Bonarda in the country’s major red category. Merlot is also grown, but the option that best fits the widely recognized major red varieties in Argentina is Bonarda.

Latitude shows how far south a place is from the equator. A coordinate of 45.36°S sits well into the southern Patagonian zone. Among the options, Mendoza and Buenos Aires lie around 32–34°S, which is much farther north. Río Negro sits near 40–41°S, still north of 45°. Chubut extends into the mid-to-upper 40s latitude, so 45.36°S falls within its territory. Since Sarmiento is a town in Chubut Province, that latitude points to Chubut as the correct location.