McLaren Vale is situated 40 kilometres south of Adelaide in South Australia and has a Mediterranean climate and an annual rainfall of approximately 650 mls. It stretches from coastal plains to the foothills of the southern Mount Lofty ranges and this creates variation in both altitude and terroir. More detailed information on the region can be found here.
Different soils and micro climates produce different wines. The vineyards of Blewitt Springs are generally sand on ironstone gravel and just under 200 metres above sea level. As a result the shiraz from this area is elegant with fine silky tannins and good length and mouth feel. Koltz also sources grapes from vineyards in the Willunga region of McLaren Vale where the soils are darker deep clay and loam and produce more robust, richer wines with firmer tannins.