While testing the Specialized Trading Ports by JamieIdle I also tried building a large harbor that does not look like "river spam"...
(https://dl.dropboxusercontent.com/u/5012419/Banished/tester/bigharbor.jpg)
* Considering there are 5 ports on a rather short stretch of river it came out pretty nice... I think... :)
@Paeng go grab the latest update. Because the changes are fairly minor it shouldn't cause game instability, but just in case you backup the old version and an old save in a separate file somewhere.
http://banishedinfo.com/mods/view/613-Specialized-Trading-Posts