What percentage of California’s wine grape harvest comes from Napa Valley?

B.

The most renowned winegrowing region in the U.S. is also one of the smallest: Only 4% of California’s wine grape harvest comes from Napa Valley, which in turn accounts for a mere 0.4% of the world’s wine production. (If California were a separate country, it would be the world’s fourth largest wine producer.) While the total size of the wine region is 500,000 acres (202,350 hectares), only 46,000 acres (18,600 hectares) are planted with grapevines. Despite its small scale, Napa is home to half of the world’s 12 recognized soil types, producing great diversity among the 35 different grape varieties represented.