Jörmungandr, also known as the World Serpent or Midgard Serpent, is an Isu later remembered as a giant serpentine sea dragon who encircled the earth in Germanic and Norse mythology and is the arch nemesis of the Isu Thor.
The son of Loki and the Jötunn giant Angrboða, Jörmungandr is the middle brother of both Fenrir, the legendary wolf prophesied to kill Odin during the final battle of Ragnarök, and the goddess Hel who rules over Helheim.
Later, Thor threw Jörmungandr violently towards the shores of Jötunheimr, which caused many ships to sink. Many jötnar drowned as a result, and a tree was deeply scarred by the serpent's sharp scales.
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