The Alcohol and Tobacco Tax and Trade Bureau (TTB) is expanding the approximately 5,360-square mile "Willamette Valley" viticultural area in northwestern Oregon, by approximately 29 square miles. Neither the established viticultural area nor the expansion area is located within any other established viticultural area. 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.