Defines a legal grape-growing area distinguished by geographical features, climate, soil, elevation, history and other definable boundaries. Rules vary widely from region to region, and change often. Just for one example, in the United States, a wine must be 85 percent from grapes grown within the viticultural area to carry the appellation name. For varietal bottling, a minimum of 75 percent of that wine must be made from the designated grape variety. See also appellation d'origine côntrolée.