The Alcohol and Tobacco Tax and Trade Bureau (TTB) establishes the approximately 17,633-acre "Moon Mountain District Sonoma County" viticultural area in Sonoma County, California. The viticultural area lies entirely within the larger Sonoma Valley viticultural area and the multicounty North 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.