"Nit-heath." After Fáfnir had murdered his father Hreiðmarr for his treasure, he fled to Gnitaheið where he made himself a lair. He then turned himself into a serpent, and laid down on the gold. Sigurðr and Fáfnir's brother Reginn went up to Gnitaheið, and found the track that Fáfnir made when he crawled to the water. Sigurðr dug a trench across the path and laid himself in ambush therein. And when the serpent glided toward the water and came above the pit, Sigurðr thrust his sword into the serpent's body to the heart and mortally wounded him.
A kenning for gold is Metal of Gnitaheið.
- Skáldskaparmál, 40.
- Völsunga saga, 18.