Black Mountains

Mountains of black rock at the southwest isthmus of Kor, incredibly tall and sharp peaked. 
The heights of the Black Mountains, and its sharp-end peaks (magnetic extrusions) are the result of magnetism in the Aurung. 
The location of Nolkor, the grandest gnome city every built, and the site of many ancient and deserted gnomish mines: including Grimothe, the deepest gnome mining city purported to delve into the center of the planet. 
The site of an extinct volcano Voldinor, with a contiguous caldera. 
The lair of Volduin the Black.
The Black Mountain crags of Grond slope away to the west and hold the cities Und and Grond deep within, as passageways to Nolkor.