Sonoma County's Russian River Valley appellation (grape growing area) is well-known, especially for Pinot Noir. It's a huge region with a total land area of 160,000 acres, or 250 square miles, with 15,000 acres of wine grapes planted.
With this big of an appellation, you often find sub-appellations to define smaller areas based mostly on microclimates and soil types. While there are a couple sub-appellations, Green Valley and Chalk Hill, some local winemakers and grape growers decided to divide it up into unofficial neighborhoods.







