A clear ranking is difficult because it is difficult to compare the wine-growing areas defined by wine legislation in the individual countries with different hierarchies. The top candidate is the historic landscape of La Mancha in Spain with around 450,000 hectares of vineyards. Within this region lies the DO area of the same name with around 200,000 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 part being the double region 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 French region of Bordeaux are divided into over 30 appellations. California also has very large wine-growing areas(AVA = American Viticultural Area).
For other records see also under the keywords smallest vineyard & vineyards, northernmost vineyard, southernmost vineyard, highest vineyard and steepest vineyard. A complete list of keywords relevant to vineyards is included under vineyard area.
Graphic: Der Winzer 1 - Viticulture, Ulmer Verlag 2019, 4th edition