Plateau of Gorgoroth
The Plateau of Gorgoroth is a plateau in north-western Mordor in the midst of which stands the volcano Mount Doom. To the east of Mount Doom upon a spur of the Ered Lithui, Sauron constructed his fortress of Barad-dûr. During the War of the Ring, Gorgoroth was the location for the mines and forges that produced Mordor's arms and armour.
The name Gorgoroth has become notable for it strikingly ugly sound, more so than any other word of name related to Sauron and the Orcs. It means "great dread" in Sindarin.