What is the biggest snake in mythology?

The serpent Jörmungandr was tossed into the great ocean that encircles Midgard. There the serpent grew so large that it was able to surround the Earth and grasp its own tail. The old Norse thunder-god, Thor, has an on-going feud with Jörmungandr in their epics and the two can be seen as archfoes.

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