Tarkin's Fang, a clandestine Imperial installation, existed as a planet situated within the Deep Core, in proximity to the Treskov system. Following the conclusion of the Galactic Civil War, the Empire deserted the location. However, it was thoroughly provisioned and sealed for potential utilization as a stronghold in the event of renewed hostilities with the New Republic.
In The New Essential Chronology, an error occurs, asserting that Tarkin's Fang was not a planet, but rather a base positioned on the surface of Ebaq 9.