Rhaandarel is a class M planet, somewhere in the space of the galaxy's Alpha or Beta Quadrants, home to the Rhaandarite civilization.
History and specifics
In the year 2381, Rhaandarel was one of the planets attacked by the Borg. This made it particularly hard for Laarin Andos, Director of the Department of Temporal Investigations, to stop people attempting to time travel and stop the attack. (DTI novel: Watching the Clock)