New Cities

Is there a limit to how close to each other you can found cities?  Is there an "influence zone" around larger cities?  Sorry if this has been answered elsewhere, I looked, but did not find...

Thanks all

Merci!

An additional note, though:

I would advise that you put a lot of thought into where you expand. 

Some terrain is more defensible than others (depending on what kind of troops you want).

Equally, you might go for a resource type-rich square nearby, one that you're particularly lacking - but do bear in mind that what seems to be the resource bottleneck now might not be the resource bottleneck later, depending on what direction you take with your city development.

Cities far, far away will take time to get going, and will be severely hampered in their support ability to of from your other city due to the travel time distance - however, they are also very well defensible (by virtue of their remoteness), and you know the map will ultimately expand out to reach you as the playerbase grows.  Big Fish in a Small Pond isn't a bad place to be, especially if you can find some random part of the map that has some incredible naturally defensive location (ie lots of impassable squares directly around).

If you're in an alliance, they might have some wishes for where you settle (eg, a powerbase of nearby players gathered together).

There are many considerations...

No to the first yes to the second (I'm quite sure).

while 20 have the ability to settle a second city, only 6 have.

i'd say you're just in time :P