Which of the following is an AVA located in Oregon?

The Chehalem Mountains is an American Viticultural Area (AVA) located in Oregon, known for its diverse microclimates and the ability to produce a wide range of wines, particularly Pinot Noir, Chardonnay, and Pinot Gris. This region benefits from varied elevation and some of the state's highest vineyards, which contribute to unique terroir expressions.

The significance of the Chehalem Mountains lies in its terroir, which includes volcanic soils, diverse slopes, and the influence of the Coast Range mountains, all of which make it suitable for grape growing. The AVA designation helps emphasize the quality and distinctiveness of the wines produced there, making it an important region within Oregon's wine industry.

In contrast, the other options are not located in Oregon. The Snake River Valley is in Idaho, the Columbia Valley spans parts of Washington and Oregon but is primarily known for its Washington vineyards, and the Hudson River Region is located in New York.