Maps in Cities XL were actually half a kilometer bigger in each direction than ALL 25 squares in this game. While the maps in this game are 'big' they are in fact smaller than the maps in Cities XL. Trade between different cities/save games has been part of every other major city simulator and it is missing from this game entirely.
those who haven't played any older city simulators, SimCity 4 in particular don't know what they are missing. After reading other peoples reaction to this idea I think that SimCity 2013 left a bad taste in everyones mouth concerning region play.