Khazad Dum

[Maerbenn]

From HoMe XII: The Peoples of Middle-earth; ‘Durin’s Folk’:

And the line of Dáin prospered, and the wealth and renown of the kingship was renewed, until there arose again for the last time an heir of that House that bore the name of Durin, and he returned to Moria; and there was light again in deep places, and the ringing of hammers and the harping of harps, until the world grew old and the Dwarves failed and the days of Durin’s race were ended.