 The large Columbia Valley AVA, established in 1984, covers almost one fourth of the state and crosses over the border into Oregon.Within this large AVA are several smaller AVAs including the Ancient Lakes, Horse Heaven Hills, Rattlesnake Hills, Red Mountain, Snipes Mountain, Wahluke Slope, Walla Walla and Yakima Valley AVAs.Of the region's 11.5 million acres (4.65 million hectares), only were planted as of 2008.