The Alcohol and Tobacco Tax and Trade Bureau (TTB) establishes the approximately 29,369-acre "Lamorinda" viticultural area in Contra Costa County, California. The viticultural area lies entirely within the larger San Francisco Bay viticultural area and the multicounty Central Coast 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.