Dwimorberg was the name in the language of the Rohirrim for the 'Haunted Mountain', called thus because of The Dead who haunted the Paths of the Dead there.

It was a large, black peak of the White Mountains, at the feet of which grew the Dimholt Wood. In the midst of this wood stood the entrance to the Paths of the Dead, taken by Aragorn, the Grey Company, Gimli, and Legolas during the War of the Ring.