Cephalo already made it possible to edit the amount of rivers by editing one of the numeric parameters. If you're comfortable using a text editor, you can edit the following line in Totestra.py: Code: #This value is used to decide if enough water has accumulated to form a river. #A lower value creates more rivers over the entire map. [B]self.RiverThreshold = 4[/B] Try making this 3 or 2. Totestra.py can not be edited using Notepad (it uses UNIX line feeds) , but can be edited using notepad++ or wordpad/word if one is careful to save the edited file as a text document. - Sam  Since you asked: Msys 1.0.10, the last version of msys with vi, uses an old minimal version of vim without DOS line feed support.