What are some up-and-coming American wine regions to watch?

Next-to-the significant wine regions in America, we found likes of Texas Hill Country, where Tempranillo and Viognier grapes prevail; Finger Lakes region from the state of New York, which supplies exceptional Riesling; and Santa Barbara County from the state of California, that is known for Pinot Noir and Chardonnay, Burgundian varietals.
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