Solera by the producers of sherry. In a Spanish sherry "solera", the vintner may transfer about a third of each barrel a year. A solera sherry has to be at least three years old when bottled. A quite similar process is called sostrera, used to produce fortified wines in the Mediterranean regions of France. In Sicily, where Marsala wine is made, the system is called "in perpetuum". Solera vinification is used in the making of Mavrodafni ("Black Laurel"), a fortified red dessert wine made in the Northern Peloponnese in Greece. Exceptional "Mavrodafni" vintages are released every 20 or 30 years: they
Georgian wine varieties are officially grown for commercial viticulture in Georgia: Traditionally, Georgian wines carry the name of the source region, district, or village, much like French regional wines such as Bordeaux or Burgundy. As with these French wines, Georgian wines are usually a blend of two or more grapes. Georgian wines are classified as sweet, semi-sweet, semi-dry, dry, fortified and sparkling. The semi-sweet varieties are the most popular. See also list of Georgian wine appellations. See also list of Georgian wine appellations. There are five main regions of viniculture, the principal region being Kakheti, which produces seventy percent of Georgia's grapes.