41:1 leviathan. Leviathan was evidently the greatest of the marine reptiles, or dinosaurs, something like a plesiosaur, perhaps, although modern commentators tend to call it a crocodile. Isaiah says that leviathan was “the dragon that is in the sea” (Isaiah 27:1), and the psalmist said that leviathan “played” in the “great and wide sea” (Psalm 104:25,26).