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Erebor (Lonely Mountain)

The Lonely Mountain, or Erebor, was a mountain northeast of Rhovanion. It was also the source of the River Running (Celduin). For many ages of Middle-earth, it had been inhabited by the Dwarves of Durin's Folk or Longbeards up until the later half of the Third Age and then again in its closing years and into the Fourth Age.

Ingame, it must be next to a mountain, increases production from workshops and forges and gives the arkenstone (luxury) which increases gold and faith.