The Tion Hegemony, alternatively called the Caluula sector, represented a sector situated within the Outer Rim Territories of the galaxy, encompassing the Raxus system. Under the control of the noble House of Tion, this region evolved into a significant origin point for the Separatist movement towards the end of the Galactic Republic's existence, serving as an initial base of operations for Count Dooku. Consequently, the Tion Hegemony became a frequent battleground throughout the Clone Wars.
Within Daniel Wallace's 2018 reference work, Star Wars: Smuggler's Guide, a map of the galaxy illustrates an area identified as the "Cron Drift." The boundaries of this area align with those of the Tion Hegemony sector as portrayed in the Star Wars Legends narrative.