AVA area in the north of California named after the river of the same name Sonoma County ( North Coast ). It stretches from Healdsburg in the north to Santa Rosa and in the south-west to Forestville and Sebastopol. The name is derived from the Russian trappers who explored this river in the early 19th century when there were still Russian trade colonies on the north coast of California. Two sub-AVA areas, each covering around 400 hectares, are Sonoma County Green Valley on the western edge and Chalk Hill on the eastern edge. It is cool, influenced by the morning mists of the nearby Pacific climate in front.
The vineyards cover a total of around 4,000 hectares of vineyards. The climate is relatively cool due to the early morning fog from the nearby Pacific coast, which often persists until midday. These conditions are for the two dominant varieties Chardonnay and Pinot Noir almost predestined, others are important Cabernet Sauvignon. Gewurztraminer. Merlot. Riesling. Sauvignon Blanc and Zinfandel, Well-known wineries are among others Clos du Bois. Gallo. Iron horse. Korbel. Marimar Estate. Ravenswood and Simi Winery,