Following on from my previous post I tried out the random mapping just to see what I might come up with. I've tried both having the rivers follow the hex edges and flow through the middle. This example is one with them following the edges. I'll post an example of the other type once I get it cleaned up. Since I didn't have any paper with large hexes handy when I did the tests I just drew some really rough "hexes" (and a few pentagons and other shapes) on paper with pencil, scanned the result later when I had access to my scanner, and then cleaned it all up in a drawing program.
Paddy Griffith's Wargaming Operation Sealion
3 hours ago