The Refinery District was the northern section of the Black Hole, a region of the Labor Valley on the planet Corellia. The Refinery District was north of the Administration District and was where most of the hypermatter refineries in the area were located. During the battle for the Black Hole in the aftermath of the Battle of Corellia, the Galactic Republic maintained a foothold at Sentinel Outpost as they battled the Sith Empire and the Coronas gang for control of the region.