Which AVA is located in Southern Oregon?

The Applegate Valley AVA is indeed located in Southern Oregon, representing a distinct wine-growing region characterized by its diverse microclimates, elevation variations, and soil types. This AVA is part of the larger Rogue Valley AVA and is known for producing a variety of wine styles, including robust red wines and aromatic whites, which take advantage of the region's warm climate and ample sunshine.

In contrast, Columbia Valley spans areas in both Washington and Oregon but is not exclusive to Southern Oregon. The Snake River Valley straddles the border of Idaho and Oregon, primarily situated in Idaho. Willamette Valley is located in northern Oregon, well-known for its Pinot Noir and other cool-climate varieties, making it geographically distant from Southern Oregon. The specificity of the Applegate Valley AVA as a Southern Oregon wine region distinguishes it in this context.