A sea serpent is an immense snake-like creature appearing in seas around the world since the earliest of times.

In Norse mythology, the Jormungandr was a sea serpent so long that is could reach around the entire world and grasp its own tail in its mouth.

In rabbinic literature, the Leviathan was a 300 mile long sea serpent that glowed in the dark and could start things on fire with its breath.

See Also: Creatures by Type » Sea Monsters, Serpents

References

Jewish Encyclopedia. Leviathan and Behemoth. URL: http://www.jewishencyclopedia.com/view.jsp?artid=275&letter=L. Retrieved on 03/14/2010.

The Holy Bible, King James Version.