A road that ran across the desolate lands of the Plateau of Gorgoroth in Mordor. It connected Sauron's Dark Tower of Barad-dûr to the heart of Mount Doom, covering a distance of some thirty miles. The road emerged from the western gate of the Barad-dûr across an iron bridge, and ran for three miles between chasms in the earth, and then proceeded along a straight westward causeway that led upward to the eastern mountainside of Orodruin. From there it circled the cone of the great volcano until it reached an eastward-facing entrance far above: the doorway to Sauron's Chambers of Fire.