Which Mendoza subregion is known for bold Malbec and high acidity due to altitude?

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Altitude drives how Malbec ripens in Mendoza. Higher elevations bring cooler nights and larger day‑night temperature swings, which slow sugar accumulation and help preserve acidity. That combination lets the grapes develop depth and tannic structure without losing freshness. The Uco Valley sits at higher altitudes than the other Mendoza subregions, so Malbec from this area tends to be bold in flavor while maintaining bright, high acidity. Maipú is lower in elevation and often yields riper, softer acidity; Luján de Cuyo is higher than Maipú but not as elevated as the Uco subregions; Cafayate is in Salta, not Mendoza, and is known for different profiles. So the subregion known for bold Malbec with high acidity due to altitude is The Uco Valley.