The Joiol system represented a stellar configuration situated within the Orus sector, itself a part of the Inner Rim Territories, and according to star system lore, it was the home of the planet named Joiol.
In the course of the Thrawn campaign, within the Joiol system, Grand Admiral Thrawn apprehended the smuggler known as Mazzic and attempted to persuade him of his innocence regarding the Ambush on Trogan.