The world-serpent encircling Midgard. Son of Loki. Thor's archenemy.
Jörmungandr, the world-serpent, is the second of Loki's children by Angrboða. Odin cast the serpent into the ocean that surrounds Midgard, where it grew until it encircled the entire world and bit its own tail. This circular position gives the serpent its other name, Midgardsormr, and underscores its function as a cosmic boundary-marker between the inhabited world and the outer chaos that surrounds it.
Thor's arch-enemy is Jörmungandr, and their confrontations are recurring themes in Eddic poetry. The most fully narrated pre-Ragnarok encounter, the fishing episode, is depicted in Hymiskviða. Thor and the giant Hymir go out to sea; Thor uses an ox-head as bait and hauls the serpent up from the deep. He holds it before him, ready to strike with Mjölnir, but Hymir cuts the line in fear and the serpent sinks back. Snorri adds in Gylfaginning that this is the third time they have met.
At Ragnarok the encounter is inevitable and fatal for both. Völuspá 56 relates that Thor, after slaying the serpent, takes nine steps and falls, overcome by the venom the serpent has spewed. Jörmungandr dies from Mjölnir's blow. This mutual annihilation is one of Ragnarok's most iconic motifs and underscores that even the gods' mightiest champion must pay the ultimate price for his victory.
The serpent's role as world-encircler is cosmologically fundamental. As long as Jörmungandr maintains its circle, Midgard's boundaries are defined. Its release at Ragnarok represents a full cosmological dissolution, an abolition of spatial boundaries. This gives the serpent an ambiguous position: both as the marker of order and as the agent of chaos.
Sources in the Eddas
- Hymiskviða 22-24
- The detailed fishing adventure in which Thor and Jörmungandr confront each other for the second time.
- Völuspá 50, 56
- Describes the serpent's advance toward land at Ragnarok and Thor's nine steps and fall.
- Lokasenna 38
- Loki identifies Jörmungandr as his own child by Angrboða.
- Gylfaginning 34, 51
- Snorri's prose accounts of the serpent's origin and the three encounters with Thor, including Ragnarok.
- Þrymskviða 1
- Side-reference confirming the serpent's role as Thor's foremost adversary in the poetic imaginative universe.
Interpretive traditions
A What we know
Jörmungandr encircles Midgard holding its tail in its jaws, a cosmological fact consistently attested.
Thor and Jörmungandr slay each other at Ragnarok, confirmed by Völuspá and Gylfaginning.
The fishing adventure in Hymiskviða is the primary poetic attestation of their pre-Ragnarok encounter.
B What we think we know
Whether the fishing narrative in Hymiskviða is older or younger than the adventure narrative Snorri recounts is debated.
It is debated whether the motif of three encounters is an original part of the myth or a Snorrian addition.
C What we do not know
It is unknown whether Jörmungandr had a cultic dimension in pre-Christian Scandinavian religion.
The origin of the world-serpent's symbolic value, whether it is an older cosmological concept or a mythologically specific Norse innovation, has not been established.