Like some trees growns in south but not north and other trees do the opposite.
Same for crops, some in ouest, some in est. Some iron in south and some cooper in north ?
It will make people move, to trade some stuff they dont have in their land.
Feudal System: I think monument is a piece of crap. What about this:
There is provinces from the begginning of the start and there is borders between them. But theese provinces are named Neutral provinces.
İf a guild builds a keep in a province, ...