Federal state in the extreme northwest of the USA, located on the Pacific coast. The capital is Olympia. It was only settled by Whites as of 1810. In the south, it borders on Oregon, on Canada in the north, and on Idaho in the east. Viticulture on a commercial scale has only been practised since the mid-20th century. After the ending of Prohibition in the USA (1920-1933), the dominant grape variety by far was the historic Concord, which is still planted today, although it is now used primarily fort he production of table grapes and grape juice. The following regions are classified as AVAÂ’s: Columbia Gorge (also in Oregon), Columbia Valley (also in Oregon), Horse Heaven Hills, Puget Sound, Rattlesnake Hills, Red Mountain, Wahluke Slope, Walla Walla Valley (also in Oregon) and Yakima Valley. The vineyard area totals around 12.000 hectares. In the west, the climate on the Pacific coast is mild and humid, with mainly white varieties planted in the small AVA Puget Sound located here. The main wine-growing region, Columbia Valley, is located in the east, behind the Cascade Mountains, which go up to an altitude of 4.400 metres. More than 95% of the total vineyard area is located here. This arid, desert-like region has dry hot summers and Arctic cold winters. The low rainfall means that irrigation must be implemented, with water drawn from the Columbia River, Snake River and Yakima River.