Great Northern Sea

The Great Northern Sea was an ocean off the coast of the Land of Ice and Snow. It was known to be extremely turbulent and stromy, that no living thing could cross. However, there were two vermin hordes that did make it from the icy land to the contenint of Mossflower Woods and Southsward. Gulo the Savage and his Horde as well as Urgan Nagru and his horde were the only creatures ever to make it through this turbulent ocean.

Books
The Great Northern Sea appears in Rakkety Tam and The Bellmaker.