 These wineries will often own or buy from vineyards in Eastern Washington and have the grapes trucked over the mountains to their facility.The warmer, drier eastern part of the state is home to the vast Columbia Valley which extends south into Oregon.The Columbia Valley AVA is further divided into several smaller AVAs including Ancient Lakes AVA, Yakima Valley, Walla Walla Valley, Red Mountain, Wahluke Slope, Horse Heaven Hills, Rattlesnake Hills and Snipes Mountain.