According to some sources, Leviathan is the beast of the sea, and is the water-based counterpart of Behemoth, the beast of the land. Leviathan is usually presented as female, while Behemoth is male. Sometimes a third creature named Ziz is mentioned alongside the other two, to represent the air. Some believe the arrival of these beasts is a sign of the end of the world.
The name “Leviathan” is derived from the Hebrew word “livyatan” which means twisted and coiled, a reference to the serpentine nature of the sea monster. Various sources describe it as a twisted or crooked serpent, or a dragon that is the enemy of light. Its size is enormous, and some of the oldest recorded mentions describe it as being 300 miles in length.