I've just found a large area where it appears that all the trees have been clear cut and all the stumps and the timber removed. The minimap however still shows the area as thickly treed. I find it implausible to believe that so many hundreds of trees can have been removed since the map was last saved. It would have taken a small army of lumberjacks...
So I think this may be a bug.
Oops, yes, definitely. The minimap shows a ridge too, just where I am standing. No ridges here.
I think perhaps we may have experienced a nuclear bomb?
I can't tell you where this is because I have no idea where I started the game. It's a not very thickly settled area. In hours of walking I have found three long abandoned farms up river from here and the area is just above a lake. -Useless to figure out where I mean, I know.
Interestingly boar, chanterelles and stringy taproot are still here even if other stuff is gone.