Located within the Columbia Valley AVA, Horse Heaven Hills is a 570,000 acre appellation bounded by the Yakima Valley to the north, the Columbia River to the south and Pine Creek to the west. The hills are geolical folds that allow constant winds to sweep across the landscape, which lowering the risk of pests and vineyard disease, but also causes the land to be severely dry. Irrigation in the Horse Heaven Hills is a necessity, with most wineries using drip irrigation as their primary means of hydrating the 6,000 acres of vines currently planted there. The soils are a combination of silty loam, volcanic remains and fractured basalt, which were deposited by the Missoula floods in prehistoric times. Bordeaux varietals are the mainstay of the region, while up and coming varietals include the great grapes of Italy.