Tolkien Gateway  Towers of the Teeth   The Towers of the Teeth
stood at the northwest corner of Mordor, the Ephel Dúath and the
Ered Lithui came together at the haunted Pass of Cirith Gorgor,
and formed a gateway into that dark land. In the early days of
Gondor, after Sauron's first defeat, the Gondorians built two
watchtowers at the entrance to the pass, to guard Mordor and
prevent the return of Sauron's servants. They failed, and the
watchtowers fell under the control of the Red Eye. They became
known as Carchost and Narchost, the Towers of the Teeth.  Other
names include the Teeth of Mordor, the Towers of the Black Gate,
and the Watch-towers of Morannon.