Napa Valley was the first AVA. Since it’s designation, it was been further subdivided into many appellations (AVAs). The soils, the weather, the microclimates and the elevations all play a part in determining the boundaries of an AVA. There are now 16 AVAs from the floor of Napa Valley and up the mountain sides. Making sense of the terroir and how it predicts the crafted wine. That is a hard one. But it is step to understand the fruit in its surrounding environment. Your palate in the stage of understanding these boundaries. Is the difference enough that one AVA seems better than most? You decide. This is a great way to explore Napa Valley, wine tour by appellation. Master Wine Tours is experienced with the appellations of Napa Valley. Take a closer look as we introduce you to the appellations of Napa Valley.