The Idran system was a star system. This system was located approximately 40,000 light years from the galactic core in the Gamma Quadrant and approximately 70,000 light years from the Bajoran system in the Alpha Quadrant.
In the 22nd century, the Quadros-1 probe conducted a stellar survey of the Gamma Quadrant, including the Idran system. This trinary star system consisted of the primary supergiant Idran (FGC-1215) and its twin O-type companions. There were no M-class planets in the system.
In 2369, the Danube-class runabout USS Rio Grande traveled through the Bajoran wormhole into the Gamma Quadrant. Upon entering the quadrant, the runabout's computer identified the nearest system as Idran based on a hydrogen-alpha spectral analysis from the Quadros-1 probe survey. Idran was located 4.7234 light years away from the terminus of the wormhole. (DS9: "Emissary"; Star Trek: Voyager, Season 7 production art )