In Norse mythology, Niðafjöll (pronounced [ˈnɪðafjɔlː], also written Niðvellir, often anglicized as Nidafjöll), which means dark mountains, are located in the northern underworld.
According to Snorri Sturluson, the good and virtuous people will live here in a golden palace after the Ragnarök, despite its proximity to Hel.
[1][2] Niðafjöll is mentioned in Völuspá from the Poetic Edda.
[3] From below the dragon dark comes forth, Nithhogg flying from Nithafjoll; The bodies of men on his wings he bears, The serpent bright: but now must I sink
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