This paper examines empirically two distinguishing aspects of the world's wine regions: their degree of specialization in certain varieties, as measured by a varietal intensity index; and their similarity with the varietal mix of other regions, as measured by a varietal-based regional similarity index. Twelve of the most important wine-producing countries, that together account for all but one-eighth of the world's winegrapes, are included in the analysis. The data refer to circa 2000 (or 1999 for EU member countries, since that is their most recent census data). These indexes provide a baseline against which to compare more recent and future vintages. They will be especially useful as producers and regulators respond at varying speeds to the impacts of climate changes, in addition to market developments, on the optimal location of production of different varieties around the world.