American viticultural areas are designated areas for growing wine-grape in the U.S. It is codified in 27 CFR 9.1. An American viticultural area is distinguishable by its unique geographical features. The boundaries of these areas are distinctly defined by the Alcohol and Tobacco Tax and Trade Bureau (TTB). An American viticultural area is defined by the TTB at the request of wineries and other petitioners. It can be quite large and can encompass portions of several states. Applicants must provide proof of geographic and climatic significance and historical precedent for wine production, in addition to suggesting and mapping the boundaries. An American viticultural area is not a grade of quality. It merely allows producers and consumers to differentiate and authenticate growing areas.