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Columbia Valley AVA - Starting just east of the Columbia Gorge AVA, the Columbia Valley AVA includes some land in Oregon and then follows the Columbia River north into Washington, becoming Washington's largest AVA.
Paul Gregutt has an excellent description of the Columbia Valley AVA posted here.
A caveat - I'm an Oregon guy, so my coverage and knowledge of Pacific Northwest wines are jilted in that direction (a deficiency I am working (drinking? Southern Oregon Super AVA - This AVA was established specifically to encompass two already-existing AVAs in Southern Oregon.