Fastitokalon

Fell Turtles are giant snapping turtles that prowl the seas and the large rivers and lakes in central Middle-earth. Also called the Turtle-fish or "Fastitocalon" (pl. "Festitycelyn"; S. "Aeg-cnimor"; pl. "Aeg-crymyr") these rare but formidable creatures grow as large as fifty feet in length. They live in deep waters but, when hungry or angry, may swim closer to the coast. There, they hunt everything from large fish to small boats piloted by foolish seamen.