Rolor Nebula
The Rolor Nebula was a nebula in the Alpha Quadrant, located on the route between the Bajoran system and the Dreon system. 

In 2372, Benjamin Sisko speculated that Kasidy Yates usually went around the Rolor Nebula on her regular cargo run from Bajor to Dreon VII. ()

In 2399, the location of the Rolor Nebula was labeled in a Federation star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters. This nebula was in or near to Federation space. ()

External link 
 

de:Rolor-Nebel
nl:Rolornevel
Nebulae