Tulbagh was the epicenter of the largest recorded earthquake in South Africa in 1969, giving it a unique and complex landscape.
The horseshoe- shaped valley gives producers a range of terriors to work with. The basin is fringed on three sides by mountains and is drained by the Klein Berg River and tributaries. The cool evening air is trapped in the valley during the day, helping to lower the daytime temperatures. The shadows of the mountain affect the temperatures as well, reducing the amount of daily sunlight that reached the grapes. The factors lengthen the ripening season, producing grapes that have had time to develop excellent flavour concentration while retaining acidity.
An assortment of grape varieties are cultivated in Tulbagh, of which Shiraz is the most important.