Maw of the Void
The Maw of the Void is a subzone of Darkshore southeast of Lor'danel. It is a massive whirlpool that all of the water of the zone, like the Cliffspring River, drains into. Jumping into it (for whatever reason) treats the player to a short cutscene of his or her character begin sucked into the whirlpool. Players end up in the Bashal'Aran Collapse, and will also get the 
[Going Down?] achievement if they have not already. You can also get the 
[Ghosts in the Dark] achievement for completing the quest from Telarius Voidstrider.
Trivia
Its name may be a reference to the StarCraft II mission of the same name.
