Sorry if this has been mentioned already, but I haven't finished the scenario yet and barely got 5 posts down before reading many non spoiler tagged spoilers.
Therefore, I don't particularly want to continue to see if this has been mentioned:
In patch R, House Achare does not get a health bonus from fresh water, despite being on a river.
Also, several rivers seem to originate on the other side of mountain ranges, flow through the mountain range, then run towards a coast line. The source needs to be moved down stream on a few of them. Minor, I know, but you might as well perfect an otherwise great map.
BTW, so far I am enjoying this scenario the most, as this is the only one I have played so far that seems to have a hand built map (bar Gift of Kylorin ldo). Against the Wall was fun because it was challenging, but I am enjoying this more simply because of the map.