Is not impossible, but it raises a question of how to pacify monsters. Compared to them, pacifying other humans is rather easy as you just have to defeat their military and their farmers leave you alone as they are generally not interested in combat.Well, according to Derren it's logistically impossible. And who is history to argue with him?![]()
This approach might also work with evil humanoids like orcs although their unbalanced civilian to soldier ration makes it harder to pacify them in the first place, but what about the real heavy hitters like Ogres, Giants or Trolls?
You would need a big army stationed there all the time during construction which does create the mentioned supply problems or you have this army exterminate whatever monster is in the area in which case its not the monster filled wilderness the OP wants.