The Lonely Mountain was a solitary peak in the north of Rhovanion, close to the border of The Greenwood.

It was unoccupied until The Third Age, when the dwarves of Khazad-dûm fled north after Durin’s Bane was discovered there. The dwarves built the great kingdom of Erebor, but it was sacked by the dragon Smaug, who occupied the Mountain for over 100 years.

Eventually, the arrival of Thorin and Company flushed out the dragon and after its death and The Battle of the Five Armies, The Lonely Mountain returned to dwarf control.