That's a vague question. You need to decide the scale , style of the map and era since transportation issues will limit the size of the city. Geography play a major role in shaping the city. Hill are used for defences, sacred places or rich people. Downwind is for the poor.

Also, you can ignore all this and move your capital in the middle of the jungle with low population, no food, no infrastructure... but with a lot of water and it could just work fine.

[QUOTE]
Growth is an exponential problem.[QUOTE]
What does that mean? Linear growth means exponential problems?