Tradition / Region: Norse mythology (Scandinavia)
Alternate Names: Midgard Serpent, World Serpent (Miðgarðsormr)
Category: Snake / world-serpent
The Myth
Jörmungandr is the immense serpent who dwells in the world-sea that surrounds Midgard, the realm of humankind. He is so vast that his body encircles the entire world, and he lies beneath the waves biting his own tail. As long as he holds his tail, the world remains intact. When he releases it, the end of all things will begin.
He is the child of Loki and the giantess Angrboða, and the brother of Fenrir and Hel. When the gods learned of these children, Odin seized them. Fenrir was bound, Hel was cast into the realm of the dead, and Jörmungandr was thrown into the great ocean. There, the serpent grew without limit until he encircled Midgard itself.
From that time onward, Jörmungandr and Thor were bound as enemies.
Thor first encounters the serpent at the hall of the giant king Útgarða-Loki. There, Thor is challenged to perform feats meant to humiliate him. One such trial is to lift a massive gray cat. Thor strains with all his strength, gripping the cat around the belly, and manages to raise one of its paws from the ground. The giants watching grow afraid. Later, Útgarða-Loki reveals that the cat was Jörmungandr in disguise, magically constrained. By lifting even part of it, Thor had nearly lifted the World Serpent and stretched the world itself.
Thor’s second great encounter with Jörmungandr occurs during a fishing expedition with the giant Hymir. When Hymir refuses to provide bait, Thor tears the head from Hymir’s strongest ox and uses it on a massive hook. They row far out into the sea, beyond where Hymir dares to go. Thor casts his line, and Jörmungandr rises from the depths, biting the hook.
Thor pulls the serpent from the water until they face one another. The sea churns, poison sprays from the serpent’s mouth, and Hymir trembles in terror. Thor braces his feet through the bottom of the boat and reaches for his hammer to strike. At that moment, Hymir cuts the line, and Jörmungandr sinks back into the sea. In some older poetic accounts, Thor succeeds in striking the serpent before it escapes, though the outcome differs across traditions.
Jörmungandr remains in the ocean, coiled around the world, waiting. His final rising is foretold in the prophecies of Ragnarök. When the end approaches, the serpent will release his tail, causing the seas to surge over the land. Earthquakes and floods will follow as Jörmungandr crawls onto the shore, filling the sky and waters with venom.
At the battlefield of Vigrid, Jörmungandr and Thor will meet for the last time. Thor will strike the World Serpent dead, but after taking nine steps away from the corpse, he will fall and die, overcome by the poison that fills the serpent’s body.
Thus Jörmungandr is fated to remain bound beneath the sea until the final battle — a serpent whose body holds the world together, and whose death will end it.