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|Other names||Ered Nimrais|
|Location||Between Gondor and Rohan|
|Description||Tall, snow-capped mountains|
|Regions||Gondor and Rohan|
The White Mountains, or Ered Nimrais (S. "Whitehorn Mountains") was a great mountain range that lay between Calenardhon/Rohan in the North and Gondor in the South. They ran 600 miles (965 kilometers) from Thrihyrne in the north-west to Mindolluin and Amon Tirith in the east. A low spur sprung off southwest, and ended at Ras Morthil.
The mountain range’s notable peaks were, from west to east, Thrihyrne, Starkhorn, Dwimorberg, Irensaga, Halifirien, Calenhad, Min-Rimmon, Erelas, Nardol, Eilenach, Amon Dîn, Mindolluin and Amon Tirith.
Halifirien, Calenhad, Min-Rimmon, Erelas, Nardol, Eilenach, and Amon Dîn were strategically chosen hilltops on the northern side of the range. They were the Warning beacons of Gondor. There was probably a beacon-row on the south side too.
There were no passes over the White Mountains. If the Fellowship of the Ring were to avoid the Gap of Rohan, they would have to follow the coast around Ras Morthil on the cape of Andrast. The only passage through the mountain range was at the Paths of the Dead, but only the most courageous (or foolhardy) ever ventured that route.
Several rivers sprung from the White Mountains, among them the Adorn, the Deeping-stream, the Snowbourn and Mering Stream on the north side, and, on the south side, the Erui, the Ringló, the Ciril, the Morthond and the Lefnui.
The White Mountains were presumably made by the Vala Aulë when he helped in the construction of Arda. It is also possible that the were created by Melkor, and served the same goal as the Misty Mountains. A third origography is given in The Lord of the Rings: A Reader's Companion: there, a giant named Tarlang helped build the mountains "in ancient days", to keep Men away from their settlements by the shore. This account was overwritten, so it may not be applicable to the greater legendarium, or it may be a pre-Númenórean myth.
In the Second Age, the White Mountains were populated by a people related to the Dunlendings who had been servants of Sauron. They swore allegiance to Isildur, but betrayed him and were cursed: they became known as the Army of the Dead.
From T.A. 2510, the northern vales and hills became under the rule of the Rohirrim, mighty horselords from the North. They settled in Helm's Deep, Dunharrow and Grimslade, and built their capital Edoras on an outlying hill.