This is Chile's most productive and internationally known wine region, due predominantly to its proximity to the national capital Santiago.
It is located directly across the Andes' from one of Argentina's wine regions: Mendoza Province.
The soil of Maipo Valley is noted for high salinity stemming from irrigation from the Maipo River and low potassium level which has some impact on the grapevines.
Vineyards in the Maule also suffer from low potassium as well as deficient nitrogen levels.
Advances in viticultural techniques have helped vineyards in these regions compensate for some of these effects.