High Quality Content by WIKIPEDIA articles! The Alexander Valley is a Californian American Viticultural Area (AVA) just north of Healdsburg in Sonoma County. It is home to many wineries and vineyards, as well as the city of Cloverdale. It is the largest and most fully planted wine region in Sonoma.Highway 101 runs through the valley, and the Russian River flows down the valley, surrounded by vineyards on both sides. From the higher elevations of the valley rim, there is view as far south as Taylor Mountain and Sonoma Mountain. The region was named for Cyrus Alexander, owner of a part of the Rancho Sotoyome Mexican land grant, in 1847. Granted AVA status in 1984, the boundaries of the appellation are defined in the Code of Federal Regulations, Title 27, Section 9.53.