The Dwimorberg was a brooding black mountain that was situated to the east of the Firienfeld in Dunharrow at the head of the valley of Harrowdale in the center of the White Mountains.
Dunharrow stood above a cliff on the valley's eastern side, parallel to the mountain itself. Beyond Dunharrow was a collection of somber pines and firs on the lower slopes of the mountain. Some of these dark trees formed a forest known as the Dimholt. This forest contained a hollow place which held a mightly standing stone that lay in front of a deep glen with a doorway leading inside the Paths of the Dead.
History
During the Second Age, the Men of the Mountains swore an oath to Isildur, King of Gondor in those days. But their fathers had worshiped Sauron in the Dark Years, and still had some love for him, and so when called upon to fulfill their oath to Gondor, they would not, and so Isildur cursed them, never to rest until they had fulfilled their oaths.
During the late Third Age, it was believed by the Rohirrim that the Dwimorberg was haunted by the spirits of the Men of the Mountains, who would occasionally enter the valley of Harrowdale like shadows, bringing with them a great unquiet as well as death.
Aragorn II eventually allowed them to finally fulfill their oath, and they were released to go in peace. After the great events at the end of the Third Age, Dwimorberg was haunted no longer.
Etymology
Dwimorberg was a name in Old English meaning "Haunted Mountain" or "Phantom Mountain", consisting of the words dwimor ("phantom, ghost, illusion, delusion, apparition") and beorg ("mountain").
