I want to apologize for my mistakenness on this map. I was lead to believe that southern netherlands was very mountainous by one of my friends, and he said the map felt pretty accurate. Turns out, there was a communication error between us. The reference pictures he sent me were from the Swiss alps, near the border of Germany and Switzerland. I am sorry for this mistake; I will double and triple check sources from now on.
The trees were custom build by me and my friend Dero. We are currently working on a large custom ultra realistic tree repository. In this map I used our Sub-Alpine Firs, Alpine firs, and Hemlocks. Expect more uploads coming soon about these trees from both of us; Dero and I are very well versed in trees.