Mirkwood

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"In some older writings, this forest’s name was translated “Mirkwood” (LR/282, WJ/239) and in at least one place Tolkien decided that Taur-nu-Fuin was the proper Elvish name of Mirkwood (UT/281). However, the canonical Elvish name of Mirkwood was Taur e-Ndaedelos “Forest of the Great Fear” (LotR/1134)."

- Eldamo