“13 You yourself stirred up the sea with your own strength; You broke the heads of the sea monsters in the waters. 14 You yourself crushed to pieces the heads of Le‧vi′a‧than.”
The description of Leviathan in the bible fits best with that of a crocodile.
But verses 13 and 14 refer symbolically to his deliverance of Israel from Egypt.
Ezekiel likens Pharaoh to a “great sea monster” in the midst of the Nile canals so the crushing of the heads of Leviathan may well refer to the crushing defeat administered to Pharaoh and his army at the time of the Exodus.
Isaiah also uses the word Leviathan to represent as an international empire headed by Satan all those in opposition to Jehovah and his worshipers.