Are you going to redo the map Frogskinner posted or are you going to do a whole new one?
I also believe the green will need to be quite large. I kind of made up the sketchs with the impression that it would be quite small about the size of European country or American state. It kind of grew though.
Now, I was thinking of keeping the far Northwestern corner as my little corner of the Green, further away from civilization. To the east the Green could widen out and become much more vast and full of peoples, more like Soltakss'
Peoples of the Green write-up.
In the original frogskinner map the western section section of the Green kind of expands and the mountain fade up towards the north. Could that corner be narrowed somewhat instead and have the mountains hook back to the sea. I attached a photo of a quick rough. I don't know if you can tell what is going on there, but that may give an idea of the basic shape.