The Iron Hills were rich in minerals, most notably iron – whence came the name of the Hills. The Hills were originally a part of the massive Iron Mountains where Morgoth dwelt; other remains of this vanished range were the Mountains of Angmar and Ered Mithrin. The Iron Hills were also the source of the River Redwater, the reddish colour of which came from iron particles in its water. The river joined with the River Running to flow into the Sea of Rhûn.
The Dwarves who first settled in the Iron Hills during the First Age were of the clan of the Longbeards, most commonly known as Durin's Folk. The Hills were mined uninterruptedly for thousands of years by them, because of the hills' rich deposits of iron. The Old Dwarf Road that crossed Mirkwood was, in fact, built by the Longbeards to connect their mansions in the Misty Mountains (namely, Khazad-dûm and Gundabad) with the Iron Hills.
There was at least one settlement in the Iron Hills, the seat of Grór and his descendants, but there is no indication of its name or precise location.
The Iron Hills were probably settled by the Dwarves of Durin's Folk for many years, with the Old Forest Road being used as a trade route and as a means for the Dwarves of the east and west to communicate. The realm of the Iron Hills was formally founded by Grór, younger son of Dáin I, in TA 2590 after the Dwarves were driven out of the Grey Mountains, because of the continuing attacks by the Cold-drakes, culminating in the death of Dáin I.
In TA 2941, the Dwarf lord Dáin Ironfoot of the Iron Hills led an army of five hundred warriors to the defense of Thorin Oakenshield which then joined in the Battle of Five Armies and fought valiantly there. After Thorin's death after the battle, the vacant throne of the Lonely Mountain passed to Thorin's cousin and friend Dáin who then became its King. The Iron Hills passed out of records afterwards but they may not have been deserted, and it was possible that Dáin and his son retained dominion over them.
Notable Dwarves of the Iron Hills
- As mentioned above, Grór was the son of Dáin I and was also the founder and first ruler of the Iron Hills.
- Náin was the son of Grór. He was killed during the Battle of Azanulbizar by the Orc lord Azog of Moria.
- Dáin II was son of Náin and became the lord of the Iron Hills after the death of his grandfather. He was considered a mighty Dwarf because he killed the Orc Azog when he was at an age which was considered young to the Dwarves. He became the King under the Mountain after the slaying of Smaug and loss of Thorin II Oakenshield in the Battle of the Five Armies, until his death during the War of the Ring.
- Thorin III was the son of Dáin II, after his father's death and soon became the Lord of both the people of the Lonely Mountain and possibly the Iron Hills. He was praised for helping to reconstruct the Lonely Mountain and Dale. During his rule a new Dwarven settlement was founded in the Glittering Caves.
|Foreign Language||Translated name|
|Belarusian Cyrillic||Жалезныя Пагоркі|
|Bulgarian Cyrillic||Железните Хълмове|
|Catalan||Turons de ferro|
|Cebuano||Puthaw nga mga Bungtod|
|Chinese (Hong Kong)||鐵丘陵|
|Corsican||Culline di Ferro|
|Danish||Jernhøjene / Jernbjergene|
|Finnish||Rautamäkiä or Rautavuoret (depending on traslator)|
|French||Collines de Fer|
|Galician||Montes de Ferro|
|Igbo||Ígwè ugwu nta|
|Irish Gaelic||Cnoic Iarann|
|Italian||Colline del Ferro|
|Kazakh||Темір төбеден (Cyrillic) Temir töbeden (Latin)|
|Kurdish||Çiyan Hesin (Kurmanji)|
|Kyrgyz Cyrillic||темир адырлар|
|Macedonian Cyrillic||Ирон Хиллс|
|Mongolian Cyrillic||Төмөр толгод|
|Pashto||ناوتو كوي غونډيو|
|Portuguese||Colinas de Ferro (Brazil)
Montes de Ferro (Portugal)
|Punjabi||ਲੋਹੇ ਦੀਆਂ ਪਹਾੜੀਆਂ|
|Romanian||Dealurile de Fier|
|Scottish Gaelic||Iarann Cnuic|
|Serbian||Гвоздена брда (Cyrillic) Gvozdena brda (Latin)|
|Sesotho||Tšepe maralla a|
|Spanish (Spain and Latin America)||Colinas de Hierro|
|Tajik Cyrillic||теппаҳо дарзмол|
|Ukrainian Cyrillic||Ірон Гіллс|
|Uzbek||Темир Тепаликлар (Cyrillic) Temir Tepaliklar (Latin)|
|Yucatec Maya||Colinas Hierro|
|Zulu||Izintaba zensimbi ?|
|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
|Dwarven Realms of Middle-earth throughout the Ages|
|Years of the Trees:||Amon Rûdh | Belegost | Khazad-dûm | Mount Gundabad | Nogrod | Nulukkizdîn | Blue Mountains|
|First Age:||Amon Rûdh | Belegost | Khazad-dûm | Mount Gundabad | Nogrod | Nulukkizdîn | Iron Hills | Blue Mountains|
|Second Age:||Khazad-dûm | Belegost | Nogrod | Mount Gundabad | Blue Mountains | Iron Hills|
|Third Age:||Grey Mountains | Iron Hills | Khazad-dûm | Lonely Mountain | Blue Mountains | Dunland|
|Fourth Age:||Glittering Caves | Khazad-dûm | Lonely Mountain | Blue Mountains | Grey Mountains | Iron Hills|