Which of the following is NOT an important AVA in Washington state?

Sonoma Valley is not an important AVA in Washington state because it is located in California, specifically within the larger Sonoma County. Washington state has several recognized AVAs that are crucial to its wine production, such as Columbia Valley, Walla Walla Valley, and Rattlesnake Hills, all of which contribute significantly to the state's reputation for high-quality wines. Columbia Valley is the largest AVA in Washington and encompasses several sub-AVAs. Walla Walla Valley is renowned for its premium wine production and has gained significant acclaim over the years. Rattlesnake Hills is also known for its unique terroir and its production of distinct varietals. In contrast, Sonoma Valley is part of California's wine country and plays no role in Washington's AVA landscape. Thus, recognizing the geography of these wine regions is crucial for understanding the context of wine production in North America.