Finally decided to report this... ;-)
Next time you're doing some DB maintenance, the table that contains the Spanish regions, ie; Asturias, Castilla & Leon, etc, there is an incorrect entry in the "regions" pull-down, presumably due to a cut/paste error.
"Antwerpen" appears as a region of Spain, visible in any page where you choose a country then a region. This appears once you've selected "Spain" as the country.
I'm not sure how languages are dealt with, but this appears in my Macbook which is set to English(UK).