Theoretically there should be no limit, but in play testing I have found (through work with Matte) that 210x210 is the maximum size that allows for the AI to create and use roads. A vital link for any civilization. The 3 number as pointed out by Scorpion has like it's predecessors been left behind and not implemented... it has no effect on the characteristics of the map... Saying that, now I have to redo a few maps... DAM... if anyone has found anything else that seems to go haywire when you increase the maps above 210x210 please let us know... I don't want to recreate maps over and over again... I've not checked palpatine's world map yet to see if it is also affected by the size issue. I would love to have found a solution other than shrinking map sizes but in a week of testing nothing has been shown... so, off to the editor to rework my map... 
Omni - the unhappy editor

Omni - the unhappy editor
I had to trim 30 tiles from the horizontal direction but it runs nicely and will be posted in 10 minutes... just one more quick test and it should be up... as for if it's 212...213...214... does it matter... I tested 215x215 and it didn't work thus it's between 210 and 215... if you care to find the exact value be my guest... 200 is good enough for me
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