Library reference · Creatures
Jörmungandr
/ˈjœrmunˌɡandr̥/Old Norse Jǫrmungandr, masculine noun: jǫrmun- 'vast' + gandr 'staff, magical creature'
The short answer
The world-serpent of Norse myth. Cast into the ocean by Odin, it grew until it circled Midgard, biting its own tail. It is Thor's great adversary: he hooks it while fishing with the giant Hymir, and kills it at Ragnarök before falling dead of its venom nine paces later.
Jörmungandr is one of the three monstrous children of Loki and the giantess Angrboða, alongside the wolf Fenrir and Hel, who rules the dead. In Snorri's Gylfaginning the gods learn of the prophecy hanging over them and act: Odin throws the serpent into the deep sea that lies around all lands, where it grows until it encircles the world and closes its jaws on its own tail.
Its story is bound to Thor's, and they meet three times. Thor rows out with the giant Hymir, baits his line with an ox head and hooks the serpent. In Snorri's retelling he hauls it up until his feet drive through the bottom of the boat, and then Hymir, in terror, cuts the line; in the poem Hymiskviða Thor strikes its head with his hammer and it sinks back into the sea. In a second episode Thor is tricked into trying to lift a great grey cat in the hall of Útgarða-Loki; the cat is the serpent in disguise, and lifting one paw is the most he can manage.
The third meeting is the last. At Ragnarök the serpent rises from the sea and Thor kills it, then walks nine paces and falls, killed by its venom.
What makes Jörmungandr unusual among Norse figures is that the archaeology confirms the story rather than merely hinting at it. The fishing scene is carved on the Altuna runestone in Uppland, on the Gosforth fishing stone in Cumbria, and on the Hørdum stone in Denmark, Viking-Age images of a myth we otherwise only read in medieval Icelandic manuscripts.
Its story is bound to Thor's, and they meet three times. Thor rows out with the giant Hymir, baits his line with an ox head and hooks the serpent. In Snorri's retelling he hauls it up until his feet drive through the bottom of the boat, and then Hymir, in terror, cuts the line; in the poem Hymiskviða Thor strikes its head with his hammer and it sinks back into the sea. In a second episode Thor is tricked into trying to lift a great grey cat in the hall of Útgarða-Loki; the cat is the serpent in disguise, and lifting one paw is the most he can manage.
The third meeting is the last. At Ragnarök the serpent rises from the sea and Thor kills it, then walks nine paces and falls, killed by its venom.
What makes Jörmungandr unusual among Norse figures is that the archaeology confirms the story rather than merely hinting at it. The fishing scene is carved on the Altuna runestone in Uppland, on the Gosforth fishing stone in Cumbria, and on the Hørdum stone in Denmark, Viking-Age images of a myth we otherwise only read in medieval Icelandic manuscripts.
Primary source Verbatim
Þá kemr inn mæri mögr Hlóðynjar, [...] drepr af móði Miðgarðs véurr, munu halir allir heimstöð ryðja; gengr fet níu Fjörgynjar burr neppr frá naðri níðs ókvíðnum.
Then comes the glorious son of Hlóðyn [...] Midgard's defender strikes in fury; all men will abandon their homes; the son of Fjörgyn walks nine paces, spent, from the serpent that fears no reproach.
VÖLUSPÁ, st. 56 · text ed. Guðni Jónsson · translation editorial ↗
Etymology
jǫrmun-
Old Norse
huge, vast: an intensifying prefix, the same element as in Jǫrmunrekr
gandr
Old Norse
staff or wand; by extension a magical being or monster
The name does not contain a word for serpent at all: it reads roughly 'the vast gandr', gandr being a staff or a magical being. Miðgarðsormr, 'Midgard's serpent', is the plainer byname.
Common misconceptions
Common claim
What the record says
“Jörmungandr is the Norse ouroboros.”
The tail-biting pose looks like the Greek-Egyptian ouroboros, and modern jewellery treats them as one symbol, but the Norse sources describe something else: a serpent grown so long that it rings the world and grips its own tail. The resemblance is of shape, not of meaning: no Norse text reads it as eternal return.
“Thor killed the Midgard Serpent on the famous fishing trip.”
The sources disagree. He hooks it with an ox head and hauls it to the gunwale; in Hymiskviða he strikes its head and it sinks back into the sea, and in Snorri's telling the giant Hymir panics and cuts the line. Úlfr Uggason's Húsdrápa does have Thor strike its head off, but Snorri prefers the version in which the serpent lives on. The kill comes at Ragnarök, and it costs Thor his life: he walks nine paces from the dead serpent and falls, poisoned.
“The world-serpent is a late literary invention of the 13th century.”
The fishing episode was carved in stone long before the Eddas were written down. The Altuna runestone in Uppland shows Thor with his foot through the boat, and the Gosforth fishing stone in Cumbria and the Hørdum stone in Denmark carry versions of the same scene.
Frequently asked questions
What does Jormungandr mean?
Roughly the vast gandr. The name contains no word for serpent: jormun- is an intensifying prefix meaning huge, and gandr means a staff or wand, and by extension a magical creature. The plainer byname is Midgardsormr, Midgard's serpent.
Is Jormungandr the same thing as the ouroboros?
No, though the pose is nearly identical and modern jewellery merges them. The Norse sources describe a serpent grown long enough to ring the world and grip its own tail; the Greek-Egyptian ouroboros is a symbol of eternal return. The likeness is of shape, not meaning; the distinction is unpacked in our ouroboros guide.
Did Thor kill the Midgard Serpent while fishing?
The sources disagree. In Snorri's Prose Edda he hooks it with an ox head and hauls it up until his feet break through the boat, but the giant Hymir panics and cuts the line. In the poem Hymiskvida Thor strikes its head with his hammer and it sinks back into the sea. Ulfr Uggason's Husdrapa says he struck its head off, but Snorri believes the serpent lives on until Ragnarok, where Thor kills it and dies of its venom nine paces later.
Is there real Viking-Age art of Jormungandr?
Yes, and it is unusually good evidence. The fishing scene is carved on the Altuna runestone in Uppland, the Gosforth fishing stone in Cumbria and the Hordum stone in Denmark, all of them centuries older than the manuscripts that tell the story.
Who are Jormungandr's siblings?
The wolf Fenrir and Hel, who rules the dead. All three are children of Loki and the giantess Angrboda, and the gods dealt with all three once the prophecies were known: the serpent was thrown into the sea, Hel into Niflheim, and Fenrir was raised among the gods until they bound him. Fenrir's side of the story is in our Fenrir guide.
Bibliography
- 1. Snorri Sturluson, Edda (Gylfaginning 34, 46–48 and 51; Skáldskaparmál), c. 1220. Trans. Anthony Faulkes, Everyman, 1987. heimskringla.no ↗
- 2. The Poetic Edda: Völuspá and Hymiskviða, Codex Regius (GKS 2365 4to), c. 1270. Trans. Carolyne Larrington, Oxford World's Classics, rev. ed. 2014. handrit.is ↗
- 3. Altuna runestone (U 1161), Uppland, Sweden; the Gosforth fishing stone, Cumbria; the Hørdum stone, Thy, Denmark: the Viking-Age carvings of Thor's fishing.
Cite this entry
VikingsBrand. “Jörmungandr.” VikingsBrand Library, reviewed 3 October 2026, vikingsbrand.co/de/pages/library/jormungandr.