Dimrill Dale was a name in the tongue of Men of the North for a valley lying east of Khazad-dûm.
The valley was also called Nanduhirion in Sindarin and Azanulbizar in Khuzdul.
A battle was fought there in 2799 T.A. between Dwarves and the Orcs of Moria, in which the latter were defeated and their leader Azog killed.
The Fellowship of the Ring encamped there having escaped from Moria, after the loss of Gandalf.
A feature of the vale was the Mirrormere, a crystal clear lake in which Durin first saw the stars. The river Silverlode ran through the vale to Lórien.