The seething spring in Niflheim from which Élivágar flow; Níðhöggr gnaws at Yggdrasil's root here.
Hvergelmir, 'the roaring cauldron' or 'the seething spring', is a primordial source located in Niflheimr, the cold and misty northern realm. According to Gylfaginning, it is from here that the eleven rivers, the Élivágar (also called the eleven streams), flow out in all directions. These rivers are among the first things to have existed; they flowed so far from their source that they solidified into venom-ice, and from this ice formed the rime-frost that filled Ginnungagap with frost and ultimately produced Ymir.
Beneath one of Yggdrasil's roots, the root that extends down toward Niflheimr, lies Hvergelmir. The serpent or dragon Níðhöggr gnaws constantly at this root, as do countless other serpents. Grímnismál 26 lists the serpents by name, and Völuspá 39 paints a picture of Níðhöggr as a central figure in the land of the dead, flying beneath the shores of Náströnd. The gnawing of the roots is part of the cosmic destruction process leading toward Ragnarök.
Hvergelmir differs from the other wells beneath Yggdrasil, Urðarbrunnr and Mímisbrunnr, as a cosmological origin of water flow and poisonous decay rather than a source of wisdom or fate. It is life-giving in the sense that it produces the rivers that in turn enabled creation, but in its present state it represents decay and a threat to Yggdrasil's continued existence.
Sources in the Eddas
- Grímnismál 26
- Odin lists the names of the serpents gnawing beneath Yggdrasil, with Níðhöggr at the forefront.
- Völuspá 39
- The völva describes Náströnd and Níðhöggr's activity in the vicinity of Hvergelmir.
- Gylfaginning 4, 16
- Snorri explains the origin of the Élivágar rivers in Hvergelmir and the well's location beneath Yggdrasil's northern root.
Interpretive traditions
A What we know
Hvergelmir is located in Niflheimr and is the origin of the eleven rivers of the Élivágar.
Níðhöggr gnaws beneath the root of Yggdrasil that is situated near Hvergelmir.
The spring is one of the oldest cosmological elements; its rivers were central to the process of creation.
B What we think we know
Whether Hvergelmir is literally located beneath Niflheimr or whether Niflheimr itself is part of the Hvergelmir complex is debated in scholarship.
It is debated whether the eleven rivers Élivágar in the surviving mythology represent an older and more extensive cosmological system.
Níðhöggr's dual role, as the gnawing serpent at the root and as an actor at Náströnd, makes it difficult to establish whether this is a unified or composite tradition.
C What we do not know
How Hvergelmir relates to the total cosmography of the nine worlds is not specified.
Whether Hvergelmir dries up, survives, or starts anew after Ragnarök is unknown.
What 'seething' or 'roaring' concretely refers to in the sources, whether it is heat, bubbles, or noise, is not explained.