The world serpent in Norse mythology is Jörmungandr, also called the Midgard Serpent. In Old Norse sources, this immense serpent encircles the human world, Midgard, and is bound to meet the thunder god Thor in a final battle at Ragnarök.
Who is Jörmungandr?
Jörmungandr is one of the beings associated with Loki and the giantess Angrboða. The Prose Edda, written by the Icelandic scholar Snorri Sturluson in the 13th century, names their three children as the wolf Fenrir, the goddess Hel, and the serpent Jörmungandr. The Poetic Edda also presents the serpent as a major figure in the myths of Thor and Ragnarök.
Odin casts Jörmungandr into the sea that surrounds Midgard. There the serpent grows so large that it lies around the world and grasps its own tail. This image explains its familiar name, the Midgard Serpent, and gives it a role in the mythic structure of the world: it marks a boundary around the realm inhabited by humans.
The name is usually rendered in English as Jörmungandr, though spellings vary when Old Norse letters are adapted. “World serpent” is a descriptive label rather than the creature’s personal name. “Midgard Serpent” is another common English name for the same figure.
Thor and the serpent
Jörmungandr is best known through its conflict with Thor. Their encounters appear in more than one episode, and they build toward their final meeting at Ragnarök. The stories present the serpent as a formidable opponent, but they do not make it a simple symbol of evil; it is a powerful being whose fate is tied to the cosmic order and its destruction.
In a famous fishing episode, Thor goes out to sea with the giant Hymir. Thor uses an ox head as bait and catches Jörmungandr. The serpent rises from the water, and Thor prepares to strike it with his hammer, Mjölnir. In Snorri’s Prose Edda, Hymir cuts the fishing line before Thor can kill the serpent, and it escapes back into the sea. The Poetic Edda preserves a related account in the poem “Hymiskviða,” though details differ between tellings.
This episode is sometimes retold as if Thor kills the serpent during the fishing trip. That is not how Snorri’s version ends: the line is severed, and Jörmungandr survives to face Thor again at Ragnarök. The distinction matters because the later encounter completes the conflict rather than repeating a victory already achieved.
Jörmungandr at Ragnarök
Ragnarök is the series of events in Norse tradition that brings catastrophe and the death of several gods, followed by the emergence of a renewed world in some accounts. Before the final battle, Jörmungandr rises from the sea. The Prose Edda describes the serpent’s movement as contributing to the upheaval of the world and the flooding of the land.
Thor and Jörmungandr fight during the battle. Thor kills the serpent with Mjölnir, but after taking nine steps he falls dead from its venom. The outcome is therefore a mutual destruction: Thor defeats the serpent, yet does not survive the encounter. The Poetic Edda’s “Völuspá” also associates Thor’s final struggle with the serpent, while Snorri gives a fuller account of the sequence.
Ragnarök accounts are not identical in every detail, and the poems and prose preserve different forms of the myth. Still, the central pattern is clear in the surviving sources: the serpent emerges, Thor kills it, and Thor dies from the poison soon afterward.
What the world serpent represents
The image of Jörmungandr surrounding Midgard makes the serpent a boundary figure. Its body encircles the human world, separating the land from the surrounding sea while also suggesting that the boundary is not secure forever. When it releases its tail and rises at Ragnarök, the established world order begins to break apart.
Readers often compare Jörmungandr’s circular form with the ouroboros, a serpent shown biting or swallowing its own tail in traditions outside Norse mythology. The images resemble each other, but resemblance alone does not establish a direct connection or shared meaning. In the Norse accounts, the important details are the serpent’s place around Midgard and its eventual battle with Thor.
Jörmungandr should also not be confused with Níðhöggr, another serpent or dragon-like being in Norse sources. Níðhöggr is associated with gnawing at the roots of Yggdrasil, the world tree; Jörmungandr is the sea-dwelling creature that encircles Midgard and fights Thor.
Names and source traditions
Jörmungandr is often translated or explained as “the great monster” or “huge serpent,” though translations of Old Norse names can vary. The alternative name “Midgard Serpent” describes its connection to Midgard rather than giving a separate creature. English spelling also varies, in part because Old Norse letters and sounds are represented differently in modern writing.
The main written sources for the surviving stories are the Poetic Edda and Snorri Sturluson’s Prose Edda. The Poetic Edda is a collection of poems preserved in medieval manuscripts; the Prose Edda is a later work that retells and explains mythological material. These texts are valuable records, but they do not give a single uniform account of every myth. When a detail differs—such as how the fishing encounter unfolds—it is best to identify the version rather than treat every retelling as identical.
Frequently Asked Questions
What is the world serpent’s name?
Its name is Jörmungandr. It is also widely called the Midgard Serpent.
Is Jörmungandr Loki’s child?
Yes. In the Prose Edda, Jörmungandr is one of the children of Loki and the giantess Angrboða, along with Fenrir and Hel.
Does Thor kill Jörmungandr?
At Ragnarök, Thor kills the serpent with Mjölnir, then dies after taking nine steps because of its venom. In the earlier fishing story, the serpent escapes in Snorri’s account.
Why is Jörmungandr called the Midgard Serpent?
It lives in the sea around Midgard and grows large enough to encircle the human world, according to the myth.
Is Jörmungandr the same as Níðhöggr?
No. They are separate figures. Jörmungandr surrounds Midgard and fights Thor; Níðhöggr is associated with the roots of Yggdrasil.
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