Niðafjöll

"Dark crags." According to Völuspá, a place in Hel where the serpent-like creature Níðhöggr comes from:

Þar kemr inn dimmi dreki fljúgandi, naðr fránn neðan frá Niðafjöllum; berr sér í fjöðrum, — flýgr völl yfir — Niðhöggr nái.

There comes the gloomy dragon flying, from beneath, from Nidafjollum; bears in feather corpse — flying over plain — Nidhoggr now pale.

Cp. Niðavellir.

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