In this map there is a narrow mountain range in between two rivers separating the two teams. The blue side is mountainous and the much wider river in the green side has many islands.

Map
http://www.mediafire.com/?ukt91p956unlwaq

Screenshots - the first one shows the blue side and the second introduces the green side
http://imageshack.us/g/802/2rivblue.png/

Here's an overview and also the colors and the height map for modders. If you modify it and put it online please give me credit.
http://imageshack.us/g/24/tworivers.png/

Made with the bitmap converter by bildramer.

In case you are going to host this please tell me the server name so I can join in too.