Sonoma is a large and diverse region. Whereas its neighbor, Napa Valley, is small and compact, Sonoma sprawls for miles. Many of the best vineyards are located north of the city of Santa Rosa, and south of the town of Cloverdale. There you'll find a concentration of superb vineyards in the Alexander and Knights Valleys. Varietal diversity rules here, with excellent versions of any number of different California wines, including Cabernet Sauvignon, Zinfandel, Merlot, Sangiovese, Syrah, Zinfandel, Chardonnay and Sauvignon Blanc.