In Norse mythology, Jörmungandr, or "Midgarðsormr" was a sea serpent so long that it encircled the entire world, Midgard. Some stories report of sailors mistaking its back for a chain of islands. Sea serpents also appear frequently in later Scandinavian folklore, particularly in that of Norway.
It is sculptured in relief, with Ogham inscriptions down each of the four angles. The front bears a celtic cross with interlacing, and the back bears symbols including fish monsters, the elephant or dolphin, double disc and z-rod.