The Dalelands by L. Richard Baker III

Between Cormyr and the Moonsea lie the beautiful forests and fields of the Dalelands, home to some of the most powerful characters and exciting adventures in the Heartlands. Proud and free, these scattered realms stand against the dark evil of Zhentil Keep and the savage raiders of the mountains and forests.  Ancient magic lies buried in dangerous ruins within the case Elven Woods, waiting for the hand bold enough to seize it.