Somewhat less famous and a touch more rustic than its neighboring wine-making county, Napa, Sonoma's viticultural output is no less esteemed — and far more abundant. The county's 13 official appellations span a diverse gamut of geographies, from the Dry Creek Valley, which yields distinctive Sauvignon Blancs and Zinfandels, to the Russian River Valley and its cool-climate varietals, including many exceptional Pinot Noirs.