Which AVA is located in the Sierra Foothills?

El Dorado AVA is situated in the Sierra Foothills region of California. This area is characterized by its diverse microclimates and elevations, which contribute to the production of a wide range of grape varieties. The Sierra Foothills is known for its gold rush history and its steep slopes that provide excellent drainage and exposure to sunlight, making it ideal for viticulture. El Dorado, in particular, supports various varietals such as Zinfandel, Barbera, and Rhone varietals, all thriving in the unique terroir of the region.

In contrast, the other options listed represent different wine regions: Napa Valley is known for its world-renowned Cabernet Sauvignon and Chardonnay, located to the west of the Sierra Foothills; Sonoma Valley, also to the west, is famous for its diverse range of wines, including Pinot Noir and Chardonnay; and Columbia Valley, which extends across Washington State and into Oregon, is known for its production of varietals like Merlot and Riesling, but is not associated with the Sierra Foothills at all. Thus, El Dorado is the accurate choice as it is the only AVA directly located in the Sierra Foothills.