|Other names||S. Emyn Engrin|
|Location||East of Erebor, northwest of Rhûn|
|Description||Hill-remnants of the Ered Engrin and a realm of many of Durin's folk|
|Regions||Wherever the King of Durin's folk has made his dwelling|
The Iron Hills were a range of hills in the northeast of the known parts of Middle-earth, border-lining Rhûn. There was also a Dwarf-realm located in the hills. The Hills were some of the remnants of the Iron Mountains where Morgoth dwelt, and had a heavy iron deposit, from which they get their name.
The Hills were mined for thousands of years by the Dwarves. Because this was the main source for most of their iron ore. The Dwarf-road of Mirkwood ran northeast to the Hills for the Dwarf-traders than went to and from Khazad-dûm and the Hills.
It officially became a Dwarf-realm in T.A. 2590, when Grór son of King Dáin I left the Grey Mountains because of the Dragons. Over hundreds of years it became a great realm, especially after the destruction of Erebor. Before the death of Smaug, the Iron Hills was the main dwelling of Durin's folk in the East, and was also the strongest realm militarily in Wilderland.