Echoriath
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In J. R. R. Tolkien's fictional universe of Middle-earth, the Echoriath or Encircling Mountains were a mountain range in the north of Beleriand.
The Echoriath formed a natural circle of rock, enclosing the valley later called Tumladen, within which lay the Elven city of Gondolin. A hidden ravine provided the only access through the Echoriath — a way guarded by seven gates.