Where in the world is Carmen San Diego? Or just plain San Diego? GeoNames turns strings of characters into latitudes and longitudes. The database includes both geographic names and political entities. Looking for "San Diego," for instance, returns the cities in California, Guatamala, and Mexico as well as lakes like Laguna San Diego. In fact, there are 7,159 entries for San Diego. The free service is limited to 2,000 queries per hour. Premium services offering better availability and a service-level agreement begin at 40 euros.