Celebrating Hispanic Hertigage Month (Sept. 15th through Oct. 15th) Argentinian Malbecs are likely one of the wines that will come to mind when considering Spanish wines.
Not that Argentinian wines weren't already on the map, Malbecs in the country have certainly made their mark. Mendoza--specifically--is the predominant wine region in the country. The area receives minimal rainfall, relying on melt-water of the Andes (Mendoza is perched on the mountain's side). Grape growing would not be possible there otherwise.
Altitude is a big factor here, with the extremely high elevation, the vineyards recieve extra UV light helping the grapes develop thicker skins and deeper color with higher--though softer--tannin levels. The cooler temeperature of the altitude helps the grapes to preserve acidity despite that they hang on the vine for longer than most grapes before harvest.
Malbecs origins hail from southwest France where it is the predominant grape of Cahors. It sometimes also plays a small role in Bordeaux blends. Malbec is darker and less black currant-fruity than Cabernet Sauvignon where it shows earthy, herby and spicy undertones.