The Bes system was a stellar neighborhood, a star system, found within the Airam sector. Its position was in the Outer Rim of the galaxy. Throughout the Galactic Civil War, two separate conflicts unfolded here, pitting the Galactic Empire against the Rebel Alliance.
Within the Outer Rim Territories, at galactic coordinates M-20, resided the Bes system, a star system situated in the Airam sector. Not long before the Battle of Nocto during the Galactic Civil War, the First Battle of Bes saw Rebel Alliance forces assault a resupply operation for the Imperial-class Star Destroyer called the Rage. Soon after, the Second Battle of Bes involved a joint Rebel/Airam effort to eliminate the Rage, though they were unsuccessful.
You can find the Bes system featured in the video game titled Star Wars: X-Wing vs. TIE Fighter: Balance of Power Campaigns.