Stone and dirt maybe, I'm still in the process of building the mountains little by little (quite a lot of work, seeing as it will surround a 400 by 400 area

 

Out of the window, 2 reasons, 1, I've seen the actual forest I took those screenshots from, it was a lag fest, even with my good computer. and 2, it's so large, that it won't satisfy me, because I'm a detail freak.

 

I'll be locking this now, I'll make a new thread when I have a bit of my re-done plan worked out and built.