Challon, situated within the Core Worlds, was a planet that maintained its neutrality throughout the duration of the Galactic Civil War. During her time on Challon, Leia Organa attempted to persuade Tchai, the local Governor, to lend support to the cause of the Rebel Alliance. Organa was compelled to eliminate Giles Durane, her "weapons master," acting in defense of her own life.
The population of Challon had a tendency to use the dismissive term "Rimworlders" when referring to those who resided on planets located in the Outer Rim Territories.