|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 Hills were mined for thousands of years by the Dwarves. They were mined, as their namesake, for iron and contained little to no mithril. 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 left the Grey Mountains after losing its dominance to 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.