Are you making something like trade routes that you want us to be able to control? Or more likely somehting where if you control enough trading cities you get a bonus of some sort. But if this were to happen it seems poorly thought out to ask a bunch of forum goers, you would get much better results with your own research. Therefore I suspect this is going to be a preview of trade and you are going to be showing how our favourite cities work in the new system...

Also my 'other' vote was originally going to be for the roman port ostia but I forgot I already picked rome. So feel free to disocunt my other vote or add your own favourite to it.