The Limestone Coast of South Australia is one of the country's most important wine producing regions, with almost one third of all Australian wines originating there. As the name suggests, this stretch of coastline is geologically significant, being made primarily of mineral rich limestone, and thus providing plenty of nutrients for the range of grape varietals that thrive there. Interestingly, unlike many of the wine regions of Australia, the Limestone Coast has a healthy water table, meaning there is plenty of moisture below the soil, and thus solving any problems relating to irrigation that causes difficulties for wineries elsewhere in the country. Plenty of different vines flourish in this fertile region, most notably Cabernet Sauvignon and Shiraz, and also many white wine varietals such as Chardonnay and Viognier. The vast region of South Australia is home to a wide variety of vineyards, growing a large range of different grape varietals. Because the South Australian wine region is so large, it benefits from a great array of climatic conditions – from dry and hot, to cool and windy – which wineries can use to their advantage when it comes to selecting the grape varietal they wish to thrive in a particular sub-region. South Australia is most commonly associated with the big, powerful and fruit-forward Shiraz wines which are produced in the cooler valley areas of the region, but recent decades have seen something of an explosion in the South Australian wine industry, leading to wineries expanding their repertoire enormously and experimenting with other fine grape varietals and making the most of their unique terroir.