Puzzling wine producing area in world map?

Please take a look at this world map (from England's Berry Bros. & Rudd) of wine producing areas:

There is a spot south (below the 30th latitude) and east of California that seems a bit puzzling. It looks to be in inland Mexico.

I know Mexico's Baja California produces wine, and is duly noted on the map, however, I was not aware of there being a wine producing area inland.

Wondering whether that spot is a cartographic error.

-- ================================================Do you like wine? Do you live in South Florida? Visit the MIAMI WINE TASTERS group at