Quote from instaQuestion;how do they stop the player from going out of the map?
In VC and the original GTA3, there was water all around the cities, with an invisible barrier that you couldn't pass. In SA there's a huge desert...so how did they work that out?
You know that bit in The Mummy, where the desert comes alive and forms a huge face? Yeah? That doesn't happen. Instead, I think there's another invisible barrier.