Niflheim

Niflheim (Old Norse, “mist-world” or “world of darkness”) is the oldest and coldest of the Nine Worlds — the primordial northern realm from which the ice of Ginnungagap flowed. Gylfaginning ch. 4 identifies it as existing “many ages before the earth was shaped” — prior even to the birth of Ymir.

Hvergelmir

At Niflheim’s center lies Hvergelmir (Old Norse, “bubbling cauldron spring”), the spring from which all rivers in the cosmos originate. The Gylfaginning names eleven rivers — the Élivágar — that flow from Hvergelmir into the void of Ginnungagap. As these rivers traveled far from their source, the frozen spray that fell from them accumulated into the ice that filled the northern half of the void. When heat from Muspelheim in the south eventually met this ice, it melted and animated the first life: Ymir.

Niflheim and the roots of Yggdrasil

One of Yggdrasil’s three great roots extends into Niflheim, where the dragon Níðhöggr gnaws at it perpetually. This gnawing is not random destruction but cosmological: Níðhöggr’s work is part of the entropy against which the Norns’ daily maintenance of the tree pushes. The two forces — decay and renewal — are in permanent tension.

Niflheim and Hel

The realm of Hel lies beneath Niflheim in the Norse sources — sometimes called Niflhel in the Eddas to distinguish it from Niflheim proper. The dead in Hel live within a sub-realm of the primordial ice-world: cold, dim, and final. The rivers draining from Hvergelmir flow through Hel as the Gjöll — the river of the dead that Hermóðr crosses on his ride to bring Baldr back.