The Iron Mountains have always been associated with bitterly cold climates partly due to the influence of the evil Kingdom of Melkor. It was also the former location of his ancient fortresses of Utumno and Angband.
After returning to Arda from the Outer Darkness with his allies through the Door of Night, he created the Iron Mountains and behind these walls safe from the light of the northern lamp Illuin he delved the great fortress of Utumno. Angband was also delved into these mountains west of Utumno. After Melkor's destruction of the Two Lamps, the Iron Mountains were connected to the Blue Mountains of the West to the Orocarni of the east. Much later when the Valar decided to protect the Elves from Melkor by defeating him and imprisoning him, the changing of the shape of Middle-earth effected the Iron Mountains as well. Afterwards, the mountain range was distorted but was still long with lengths stretching from the Helcaraxë in the far northwest to the Orocarni in the far east and rising to immense and frighting heights, with enormous peaks such as Thangorodrim. 
In the days of the War of the Jewels, the mountains protected Morgoth from being outflanked from the rear and with no enemy behind him, he was able to concentrate on the south. Because of its perilous heights, frightening looks, and foul winds, no Elf ever passed through the mountains for any reason but the spies of Morgoth would always find ways into the Beleriand, by unknown ways through the mountains. Morgoth's forces also captured Elves and brought them through the mountains to Angband.
After the War of Wrath the Iron Mountains and Thangorodrim were destroyed and the vast mountain chain was broken and disappeared for a great part of their length. North of the range lay the Forodwaith, a region of ever-lasting cold. Remnants of the great mountain range in the Third Age included the Mountains of Angmar in northern Eriador, as well as the Ered Mithrin and the Iron Hills of northern Rhovanion. The Iron Mountains remained unchanged after the Change of the World and ever after. The only people known to have lived in the cold climates of the Forodwaith were a Mannish people known as the Lossoth, the descendants of the people known as the Forodwaith who once lived in the area around the Iron Mountains of the Ice-Bay of Forochel.
Translations around the worldEdit
|Foreign Language||Translated name|
|Belarusian Cyrillic||жалезныя горы|
|Bulgarian Cyrillic||Железни Планини|
|Catalan||Muntanyes de Ferro|
|Chinese (Hong Kong)||鐵山脈 A.K.A. 英格林山脈|
|Corsican||Montagna di Ferru|
|Fijian||Ulunivanua ni kaukamea|
|Filipino||Ang mga bundok ng bakal|
|French||Monts de Fer|
|Galician||Montañas de Ferro|
|Irish Gaelic||Iarann Sléibhte|
|Italian||Montagne di Ferro|
|Kazakh Cyrillic||темір таулары|
|Kurdish||Çییان حهسین ? (Arabic script) Çiyan Hesin (Latin)|
|Macedonian Cyrillic||Железо Планини|
|Mongolian Cyrillic||төмөр уулс|
|Old English||Īsen Beorg|
|Portuguese||Montanhas de Ferro|
|Querétaro Otomi||T'o̲ho̲ ne ya hierro|
|Romanian||Munti de Fier|
|Scottish Gaelic||Iarann Beanntan|
|Serbian||Ирон Планине (Cyrillic) Gvozdene Planine (Latin)|
|Spanish||Montañas de Hierro|
|Swahili||Milima ya Chuma|
|Tahitian||Auri te mau moua|
|Tajik Cyrillic||Дарзмол Кӯҳҳои|
|Tongan||Ngaahi mo'unga 'a e va'a ukamea|
|Ukrainian Cyrillic||залізні гори|
|Uzbek||Темир Тоғлар (Cyrillic) Temir Tog'lar (Latin)|
|Yoyuba||Irin Okegiga ?|
|Mountain Ranges of Arda|
Ash Mountains | Echoriath | Ephel Dúath | Ered Gorgoroth | Blue Mountains | Ered Lómin | Grey Mountains | Ered Wethrin | Iron Hills | Iron Mountains | Misty Mountains | Mountains of Angmar | Mountains of Mirkwood | Mountains of Mithrim | Orocarni | Pelóri | Wall of the Sun | White Mountains | Yellow Mountains
- ↑ The Atlas of Middle-earth, Thematic Maps, "Climate"
- ↑ 2.0 2.1 The Silmarillion, Quenta Silmarillion, Chapter I: "Of the Beginning of Days"
- ↑ 3.0 3.1 3.2 The Atlas of Middle-earth, The First Age, The Elder Days, "Introduction"
- ↑ The Silmarillion, Quenta Silmarillion, Chapter III: "Of the Coming of the Elves and the Captivity of Melkor"
- ↑ The Atlas of Middle-earth, The First Age, The Elder Days, "Beleriand and the Lands to the North"
- ↑ The Silmarillion, Quenta Silmarillion, Chapter XIII: "Of the Return of the Noldor"
- ↑ The Atlas of Middle-earth, The Second Age, "Introduction"
- ↑ The Silmarillion, Akallabêth (The Downfall of Númenor)
- ↑ The Atlas of Middle-earth, The Third Age, "Introduction"
- ↑ The Lord of the Rings, Appendix A: Annals of the Kings and Rulers, I: The Númenórean Kings, (iii): "Eriador, Arnor, and the Heirs of Isildur"
- ↑ The Complete Guide to Middle-earth