High Quality Content by WIKIPEDIA articles! In J. R. R. Tolkien`s fantasy world of Middle-earth, the Misty Mountains (also known by its Sindarin name of Hithaeglir—misspelled as Hithaiglin on the original Lord of the Rings map—and as the Mountains of Mist) is a mountain range, running for 795 miles (1280 kilometres) from north to south, between Eriador and the valley of the Great River, Anduin, and from Mount Gundabad in the far north to Methedras in the south.