The Rolor Nebula is an interstellar dust cloud located near the Demilitarized Zone, in the flight path between the Bajor system and the Dreon system. Ships moving between the two systems generally go around the nebula. Most of the nebula is within the Kivis Sector but part of it does extend down into the Sigma Dorphus Sector.
|Sigma Dorphus Sector|
|Free Haven Sector|
For more info on nebula see Starfleet Science file Nebula.