Napa Valley is an area of California on Earth that is famous for its wine. It was still producing wine in the 24th century.
In 2168, Veronica Fletcher said she would use her twelve years of back pay with combat bonuses to buy a vineyard in Napa Valley. (ST - Destiny novel: Gods of Night)
In 2370, Quark had a bottle of Trefethen from the Napa Valley which he shared with the crew of Deep Space 9. (DS9 novel: Antimatter)