The Fourth Quadrant is one way of describing the poorly explored and lightly settled quarter of the galaxy never under the control of the Republic, the Sith or any other major known powers. Similar to the Outer Rim? regions, but extends all the way to the .

Aysemius and Bozu-Zok Quintus are in the Fourth Quadrant. It is also proposed by Vandur Hale that the Dark Swarm is developing an advanced TCV Depot Population there as well.