On The Frontier
The Gull Islands are only known in the sense that they been seen on the horizon from shipping en route to and from Greyana and Rothen. There is a very dangerous coral reef which surrounds the small 5 island archipelago, as well as a terrible eddy current which would almost assuredly end with a shipwreck from which it would be difficult to escape.
Many years ago Greyannan wizards trained in Stone Tower attempted to scry information about the island chain, but were unable to look more closely than the closest ships. In fact every attempt to use magic to help with shipping to begin a possibly lucrative fishing industry has been rebuffed by unknown means. Even teleportation has been thwarted, much to a wet wizards chagrin.
Currently the Gull Islands fall under the purview of the Greyannan navy, but other than inquisitive sailors it is generally avoided.