Fahleena III was the inhabited third planet in its star system.
Along with Mariah IV and Ultima Thule, Fahleena III was a stop on a route formerly taken by Valerian traders supplying weapons-grade dolamide to the Cardassians.
The Valerian transport ship Sherval Das visited this planet in 2369. (DS9: "Dramatis Personae")
This planet was only mentioned in dialogue.