A clear ranking is difficult because it is difficult to compare the wine-growing areas with different hierarchies defined by wine law in the individual countries. The leading candidate is Castilla-La Mancha in Spain with around 300,000 hectares of vineyards. Within this region lies the DO area of La Man cha with around 150,000 hectares. The French Midi is just as vast, with over 400,000 hectares of vineyards. This area consists of several wine-growing regions, the largest of which is the dual region of Languedoc-Roussillon with 224,000 hectares. In Italy, Sicily is by far the largest wine-growing region with over 110,000 hectares. The 113,000 hectares of the Bordeaux region are divided into 65 appellations. There are also large wine-growing areas in California(AVA = American Viticultural Area). However, as each state in the USA has an AVA area for the entire state, this is not very meaningful.
See also the keywords smallest vineyards & vineyards, highest vineyard, steepest vineyard, southernmost vineyard and northernmost vineyard as well as superlatives in viticulture under records. Complete lists of related keywords can be found under vineyard area and grapevine.
Graphic: Der Winzer 1 - Viticulture, Ulmer Verlag 2019, 4th edition
The glossary is a monumental achievement and one of the most important contributions to wine knowledge. Of all the encyclopaedias I use on the subject of wine, it is by far the most important. That was the case ten years ago and it hasn't changed since.
Andreas Essl
Autor, Modena