Horse Heaven Hills is an American Viticultural Area (AVA) in southeastern Washington lying in portions of Klickitat, Yakima, and Benton counties, north and west of the Columbia River and south of the Yakima Valley and lies within the vast Columbia Valley appellation. Horse Heaven Hills was established by the Alcohol and Tobacco Tax and Trade Bureau {TTB), Treasury on June 30, 2005 after reviewing the petition filed by Paul D. Lucas on behalf of regional wine grape growers. Horse Heaven Hills viticultural area is about 60 miles (97 km) long and 22 miles (35 km) wide located 115 miles (185 km) east from Vancouver, Washington. The appellation encompasses 570,000 acres (891 sq mi) with about 6,400 acres (2,590 ha) under vine.

Benton County is a county in the south-central portion of the U.S. state of Washington. As of the 2020 census, its population was 206,873. The county seat is Prosser, and its most populous city is Kennewick. The Columbia River demarcates the county's north, south, and east boundaries.