Wines are produced in significant growing regions where vineyards are planted. Wine grapes berries mostly grow between the 30th and the 50th degrees of latitude, in both the Northern and Southern Hemispheres, typically in regions of Mediterranean climate. Grapes will sometimes grow beyond this range, thus minor amounts of wine are made in some rather unexpected places.
In 2021, the five largest producers of wine in the world were, in order, Italy, France, Spain, the United States, and China.
Tuscan wine is Italian wine from the Tuscany region. Located in central Italy along the Tyrrhenian coast, Tuscany is home to some of the world's most notable wine regions. Chianti, Brunello di Montalcino and Vino Nobile di Montepulciano are primarily made with Sangiovese grape whereas the Vernaccia grape is the basis of the white Vernaccia di San Gimignano. Tuscany is also known for the dessert wine Vin Santo, made from a variety of the region's grapes. Tuscany has forty-one denominazioni di origine controllata (DOC) and eleven denominazioni di origine controllata e garantita (DOCG). In the 1970s a new class of wines known in the trade as "Super Tuscans" emerged. These wines were made outside DOC/DOCG regulations but were considered of high quality and commanded high prices. Many of these wines became cult wines. In the reformation of the Italian classification system many of the original Super Tuscans now qualify as DOC or DOCG wines (such as the new Bolgheri label) but some producers still prefer the declassified rankings or to use the Indicazione Geografica Tipica (IGT) classification of Toscana. Tuscany has six sub-categories of IGT wines today.
The Barossa Valley wine region is one of Australia's oldest and prestigious wine regions. Located in South Australia, the Barossa Valley is about 56 km (35 miles) northeast of the city of Adelaide. Unlike most of Australia whose wine industry was heavily influenced by the British, the wine industry of the Barossa Valley was founded by German settlers fleeing persecution from the Prussian province of Silesia (in what is now Poland). The warm continental climate of the region promoted the production of very ripe grapes that was the linchpin of the early Australian fortified wine industry. As the modern Australian wine industry shifted towards red table wines (particularly those made by the prestigious Cabernet Sauvignon) in the mid-20th century, the Barossa Valley fell out of favor due to its reputation for being largely a Syrah from producers whose grapes were destined for blending. During this period the name "Barossa Valley" rarely appeared on wine labels. In the 1980s, the emergence of several boutique families specializing in old vine Shiraz wines began to capture international attention for the distinctive style of Barossa Shiraz, a full bodied red wine with rich chocolate and spice notes. This led to a renaissance in the Barossa Valley which catapulted the region to the forefront of the Australian wine industry.
Many of Australia's largest and most notable wineries are either headquartered or own extensive holdings in the Barossa Valley. These include such wineries as Penfolds, Peter Lehmann, Orlando Wines, Seppeltsfield, Wolf Blass and Yalumba. Many Shiraz vines in the Barossa Valley are several decades old, with some vineyards planted with old vines that are 100–150 years old including Turkey Flat in Tanunda that is home to the oldest commercially producing grape vines, originally planted in 1847. Other grape varieties grown in the Barossa Valley include Grenache, Mourvedre, Cabernet Sauvignon, Riesling, Chardonnay and Semillon.
In viticulture, the climates of wine regions are categorised based on the overall characteristics of the area's climate during the growing season. While variations in macroclimate are acknowledged, the climates of most wine regions are categorised (somewhat loosely based on the Köppen climate classification) as being part of a Mediterranean (for example Tuscany), maritime (ex: Bordeaux) or continental climate (ex: Columbia Valley). The majority of the world's premium wine production takes place in one of these three climate categories in locations between the 30th parallel and 50th parallel in both the Northern Hemisphere and Southern Hemisphere. While viticulture does exist in some tropical climates, most notably Brazil, the amount of quality wine production in those areas is so small that the climate effect has not been as extensively studied as other categories.