The Alcohol and Tobacco Tax and Trade Bureau (TTB) establishes the approximately 3,770-acre "The Rocks District of Milton-Freewater" viticultural area in Umatilla County, Oregon. The viticultural area lies entirely within the Walla Walla Valley viticultural area which, in turn, lies within the Columbia Valley 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.