The Uncharted Deep
Beyond All Sounding
The Uncharted Deep is the water along the northern edge of the Uncharted, reaching east from Kela past the Teytan Coast, and it is the incomprehensibly deep water of the planet, deeper by far than the deepest ground anyone has ever measured. It answers to the same rules as the continent it borders. Navigation and electronics fail as a vessel draws near, and pilots treat that failure as the last warning to turn back before it is too late.
Nothing that has gone far into it has returned to describe it. It is not that the Deep is dangerous in the ordinary way a cold sea is dangerous. It is that the Deep, like the Uncharted, does not permit the instruments that would let anyone know where they are, and the water and the weather close the door behind them.
the Blackwing Titanbird rides the coastal boundary between northern Thazvaar and the Uncharted here, and no one has followed one out over the Deep and come back to say where it went.