In Norse mythology, Jörmungandr (Old Norse: Jǫrmungandr, pronounced (ˈjɔrmuŋɡandr̥), meaning "huge monster ''), often written as Jormungand, or Jörmungand and also known as the Midgard Serpent (Old Norse: Miðgarðsormur), or World Serpent, is a sea serpent, the middle child of the giantess Angrboða and Loki. According to the Prose Edda, Odin took Loki 's three children by Angrboða -- the wolf Fenrir, Hel, and Jörmungandr -- and tossed Jörmungandr into the great ocean that encircles Midgard. The serpent grew so large that it was able to surround the earth and grasp its own tail. As a result, it received the name of the Midgard Serpent or World Serpent. When it releases its tail, Ragnarök will begin. Jörmungandr 's arch - enemy is the thunder - god, Thor. It is an example of an ouroboros.
which child of loki is so large that it encircles the earth
Jörmungandr Jörmungandr Jörmungandr Jörmungandr