Saltah'na was the formerly inhabited fifth planet of star system in the Gamma Quadrant. It was the homeworld of the Saltah'na, until their extinction.
In 2369, on a bio-survey mission to the Gamma Quadrant, the Klingon Vor'cha-class starship IKS Toh'Kaht visited the planet on the twenty-second day of its mission. After the planet was explored, it was rejected as a potential future site for a Klingon colony. The crew discovered the energy spheres which possessed a telepathic archive. The archive described a power struggle which ended with the destruction of the Saltah'na. (DS9: "Dramatis Personae")
This planet was only mentioned in dialogue.
The Star Trek: Star Charts (p. 74,75) shows a star named Saltah'na, an M-class star. The system was a location visited by the Gamma Quadrant Bio-Survey (2369-75).