Washington State is the second-largest producer of premium wines in the United States, after Napa Valley in California. Divided into a total of nine viticultural areas (AVA), these are Yakima Valley, Columbia Valley, Red Mountain, Walla Walla, Puget Sound, Columbia Gorge, Horse Heaven Hills, Wahluke Slope, and Rattlesnake Hills. The origins of this wine region date back to the mid-19th century, led by Old World immigrants who began cultivating grapes to produce wine, initially for domestic consumption.