The Braid is a massive "reverse waterspout" in the Darklands level of Orv. It links the Sightless Sea with the Inverted Sea. It forms at the centre of the Sunless Sea, below what was once the Azlant Empire.
It is several miles wide, and a mile high, spiralling up to the roof of the vault containing the Sightless Sea.
It establishes a current which flows from the Sightless Sea flows up the Braid, through the Inverted Sea, into the Arcadian Ocean and then into the Inner Sea. From there it seeps down into Lake Nirthran and eventually finds its way back into the Sightless Sea.