Soolahn was a star system, located somewhere in the space of the galaxy's Alpha or Beta Quadrants.
History and specifics[]
The Soolahn system was located "beyond Antares", matching a lyric in a song, "Beyond Antares". The location's reminiscence to the music piece was noted in a conversation between Captain James T. Kirk and Ensign Selena Karras.
In the 2260s decade, the Soolahn system was slated to be the target of a science expedition by the Federation starship USS Horizon led by Doctor Erdel. (TOS novel: Legacy)