Which region is NOT part of the Columbia Gorge AVA?

The Columbia Gorge AVA (American Viticultural Area) is a designated wine-growing region that spans the border between Oregon and Washington. This AVA is known for its diverse climatic and geographic features, which contribute to a wide variety of wine styles. The important point is that the Columbia Gorge AVA is strictly located within these two states.

Napa Valley, located in California, is a well-known wine region that produces a significant amount of high-quality wines, particularly Cabernet Sauvignon and Chardonnay. Since Napa Valley is not situated within the boundaries of the Columbia Gorge AVA, it is correctly identified as the region that does not belong to this specific AVA. The other options—Oregon and Washington—are both parts of the Columbia Gorge AVA, which solidifies the understanding that Napa Valley is the outlier in this context.