The region shows the approximate area where the card can be used; the area must be greater than 5 square miles. CardValet can typically map the transaction down to a ZIP code or city. If the city or ZIP code of the merchant overlaps with the selected region in the map, then the transaction can still go through. There are instances where a merchant location cannot be mapped down to a ZIP code or city, in which case CardValet will default to a state-level match.