hmmm, I can't say a thing about it. I had to orient myself on old original maps the german LG's used. I just did a newer and better looking version for them. The map layout didn't come from my own fantasy.

I also think that the image you have in mind is not quite right in this case. The darker and lighter green areas, did not show different heights on this map. Afaik the plains around the forest are almost even - more or less that is.

But I will ask my friend about this.
Thanks for the hint.