Darklands

The Darklands were located underneath the heart of Faerûn and formed an important domain of the Underdark.

Geography
Located above the Darklands was the Dragon Coast, portions of the Orsraun Mountains, and Turmish. This vast subterrean realm stretched all the way from Cairnheim (the realm of the Dodkong) in the west to the foul warrens of Traaskl Thorog beneath Chessenta in the east.

Cities
The great duergar city of Dunspeirrin was the most powerful stronghold in the region. It must be noted the duergar controled only a relatively small part of the Darklands due to the sheer size of the region.