Mordor is surrounded by mountain ranges: the Ered Lithui (Sindarin: "Mountains of Ash") in the north, the Ephel Dúath (Sindarin: Mountains of Shadow) in the west and another mountain range in the south. In the northwest is the plateau Gorgoroth. At the foothills of the Ered Lithui in northwestern Mordor was Sauron's main fortress Barad-dûr. Southwest of Barad-dûr lay the volcano Mount Doom.