The Sombure sector, a region found within the Mid Rim, was a sector that shared borders with the Irnaj, Iska, Oriolan, Wornal, and Yushan sectors.
Moff Utoxx Prentioch held dominion over the Sombure sector. Following the significant Galactic Empire loss during the Battle of Endor, Prentioch commandeered the sector's military resources and proceeded to establish his own empire.