 Located among the foothills south of the Saddle Mountains, the Wahluke Slope is one of the warmest and driest regions in the state.The Columbia River forms the western and southern boundaries of the AVA with the Hanford Reach National Monument bordering the appellation on the east.The vintage characteristics of Wahluke slope are very consistent year to year due to the area's reliably dry, warm climate and uniform coarse gravelly sand soils that drain water well.