👉 The word 'Napa Valley' comes from Old Norse, which translates to 'Nepal'. It refers to a large valley in California, USA, surrounded by the Sierra Nevada mountains on one side and the Santa Clara Mountains on the other. Definition: "Napa Valley" is a French expression that originally referred to the wine region of Napa County, California. It can also refer to the village itself which has been named after Robert Napa, the founder who was instrumental in creating the area as a destination for wine tourism. The valley's climate and geography make it ideal for winemaking with its warm summers and cool winters and rolling hills. It is known for being the home of the Napa Valley Winegrowers Association (NVWA), which represents over 300 wineries, making it one of the most recognized wineries in the United States.