The Alcohol and Tobacco Tax and Trade Bureau (TTB) establishes the approximately 4,800-square mile "Indiana Uplands" viticultural area in south-central Indiana. TTB also modifies the boundary of the established 26,000-square mile Ohio River Valley viticultural area to eliminate a potential overlap with the Indiana Uplands viticultural area. The modification decreases the size of the Ohio River Valley viticultural area by approximately 1,530 square miles. TTB designates viticultural areas to allow vintners to better describe the origin of their wines and to allow consumers to better identify wines they may purchase.