Jodien
Chieftain
The oddest thing is that when you have a culture-free area right in the middle of your territory because of your cities are yet to expand cultural borders to close that 'hole'.
The AI settlers, escorted by good defender units, just seem to know that spot very well, although they don't have its map!
I figure out their intent soon enough and ask them to leave my territory. They do, but instead of going back to where they belong, they are automatically teleported to that culture-free hole in an instant and build their city earlier that they hope!!
So now I generally leave them and concentrate to guard those gaps with a unit or two. When someone starts coming in that direction, I push some more units (any unit will do) to cut their progress.
Also, if you have neighbor civs at your souther border, for instance, and a largely unpopulated area (mostly polar areas), be sure to expand southwards first and nothwards second, then make one of your northern cities produce settlers to populate the north before the other civs start to come with galleys.
The AI settlers, escorted by good defender units, just seem to know that spot very well, although they don't have its map!
I figure out their intent soon enough and ask them to leave my territory. They do, but instead of going back to where they belong, they are automatically teleported to that culture-free hole in an instant and build their city earlier that they hope!!
So now I generally leave them and concentrate to guard those gaps with a unit or two. When someone starts coming in that direction, I push some more units (any unit will do) to cut their progress.
Also, if you have neighbor civs at your souther border, for instance, and a largely unpopulated area (mostly polar areas), be sure to expand southwards first and nothwards second, then make one of your northern cities produce settlers to populate the north before the other civs start to come with galleys.