| country | America |
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Napa Valley located in Napa County, California is widely considered one of the top wine regions in California, and all of the United States with a history dating back to the nineteenth century. The combination of Mediterranean climate, geography and geology of the valley are conducive to growing quality wine grapes. Several microclimates exist within the area due to various weather and geographical influences. The open southern end of the valley floor is cooler during the growing season due to the proximity of San Pablo Bay while the sheltered, closed northern end is often much warmer.