Khazad-Dûm, also known as Moria or Azanulbizar, was an ancient dwarf kingdom that was considered to be the most grandest and most famous than any other kingdom in Middle-Earth. For generations, the Dwarves of Khazad-Dûm built their greatest community and sought to expand everything underneath the Misty Mountains. The whole city laid in the central parts of the Misty Mountains, and it was tunneled and carved through the living rock of the mountains themselves.
Founded in the early First Age in caves beneath Hithaeglir, the overlooks and incorporates of the holy vale were called "Azanulbizar". Khazad-Dûm has since been expanded to include seven principal levels which would stretch the width of the mountain range and extend under the three mountains Caradhras, Fanuidhol, and Celebdil. Early in the Second Age, the Dwarves discovered Mithril and many from the Ered Luin which migrated to Durin's home. However, during the Third Age, Khazad-Dûm was abandoned in TA 1982 when legions of Orcs had infiltrated the city and took it as their own base.