|Region:||The Plateau of Gorgoroth|
Here the ground opens up onto a great abyss beneath Barad-dûr. This chasm can also be accessed through the Dungeons of Barad-dûr, however one cannot simply jump down without suffering incapacitation. Instead, the Dungeons and the Abyss of Mordath within must normally be entered through the main gate.
The following deeds can be advanced by visiting this location:
-  Into the Abyss
- The Abyss of Mordath lies beneath Barad-dûr. When the tower collapsed, so too was the earth beneath it sundered. This pit north of the main gate of Barad-dûr opens upon the now exposed Abyss. Gimli was able to secure a rope to climb down to a rocky landing providing access to the Dungeons of Barad-dûr. 
|Settlements and Landmarks of Dor Amarth
|Settlements:||Lûghash, the Flaming Spire • Ruins of Díngarth|
|Landmarks:||Barad-dûr (Barad-dûr, T.A. 3017) • Blozronk • Ered Lithui • Fushaum Tûm • Iant Ruin • Isenmouthe • Mordath • Nauronk • Orodruin Northern Slopes • Orodruin Western Foothills • Orodruin Western Peak • Sárronk|