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This article contains information, pictures or media from non-canonical sources. To find out more about what is considered canon see LOTR:Canon
The Hidden Vale, named fully the Secret Library of Shadow and also called Raven Vale, was a secret place in Mordor at Barad-dur's east in which Sauron established a great store of his secret knowledge, so that if his Dark Tower were to fall, this chamber of his artifacts and documents might remain.