Jörmungandr

Sea serpent in Norse mythology

In Norse mythology, Jörmungandr, also known as the Midgard Serpent or World Serpent, is an unfathomably large sea serpent or worm who dwells in the world sea, encircling the Earth (Midgard) and biting his own tail, an example of an ouroboros. As a result of it surrounding Midgard it is referred to as the World Serpent. Jörmungandr releasing its tail is one of the signs of the beginning of Ragnarök.

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