Since the first gta game (i think), there was always sea around the map.
But i have seen some people saying that its unrealistic to have a city in the middle of nowhere.
In red redemption however, there was no sea but the reason for that was because there were no planes so no were to go to.
But what about the idea to have some land around the city, but you can't go to it because there is a invisible wall?
Or something else? Post your idea, i am interested to see that.