The Tarshan system existed within the Maerdocian sector, which itself was situated in the Slice region of the Mid Rim. Notably, its designation mirrored that of Tarshan Ring Excavations.
In the Online Companion found on StarWars.com for the 2009 publication The Essential Atlas, penned by Daniel Wallace along with Jason Fry, the Tarshan system was originally documented and assigned coordinate Q-12.