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The city originated in Tolkien's poetry from before he had even begun to work on the Legendarium in earnest. Within the framework of the Lost Tales, it has already been abandoned by the Gnomes long before Eriol comes to Kortirion, which was built in its memory. It was reachable by some human children in their sleep via the Olórë Mallë, the Path of Dreams, until that was shut.
 See also