Tales of the Northern March
This primarily birch forest is home to high elves waging an ongoing war against fomorians under the surrounding mountains. The conflict has been raging for centuries, with neither side ever gaining the upper hand or any ground. Peace-loving fey have long since abandoned the woodlands. All that remain now are violent predators (displacer beasts, owlbears, and the like) left unchecked by the lack of attention from the residents. Most travelers give the glen a wide berth.