Kakheti is the most important wine region in Georgia in quantitative, qualitative and even historic terms. Almost three-quarters of the country's wine grapes are grown here, on land that has been used for viticulture for thousands of years. Viniculturally speaking, the area is unofficially divided into several sub-regions, and even a number of microregions. This creates a huge variety of mesoclimates for viticulture with an equally large variety of grape varieties found throughout. The most significant of these center around the villages of Tsinandali, Telavi, Gurajaani, Kvareli, Sagarejo and Sighnahi, which dot the banks of the Alazani River as it flows from the Caucasus Mountains to the Mingecevir reservoir in western Azerbaijan.