Inner Rim

The Inner Rim, originally known simply as the Rim, was a region of the galaxy located between the Colonies and the Expansion Region. The planet Onderon was located in the Inner Rim, as well as the planets Riosa, Birren, Bastatha, Denon, Gorse and its moon, Cynda.

Early history
The galactic region known as the Inner Rim was once the frontier of galactic civilization for centuries. When originally settled, this area was known simply as "the Rim", but competition for resources saw the need to expand, and the known galaxy grew into areas such as the Mid Rim and the Outer Rim Territories. The Inner Rim remained prosperous, however, as colonization spread outwards.

Clone Wars
During the Clone Wars, the Separatist Subjugator-class heavy cruiser Malevolence crashed onto the Dead moon of Antar in the Inner Rim during the Battle of the Kaliida Nebula. The Inner Rim world of Onderon later joined Count Dooku's Confederacy. The planet was represented in the Separatist Senate by Mina Bonteri, who was later assassinated by Separatist agents under Dooku.

The Inner Rim planet Quarzite was home to the warring Belugan and Kage species. In 20 BBY, the bounty hunters Asajj Ventress and Boba Fett accepted a job from the Belugan dictator Otua Blank to deliver a chest. After learning that the chest contained a young Kage woman named Pluma Sodi, Asajj refused to proceed with the mission. When Fett insisted on carrying on with the job, Ventress threw him into the chest and handed Fett to Otua Blank. She then freed Pluma and returned her to her brother Krismo Sodi.

In 20 BBY, the Galactic Republic sent a team consisting of the Jedi Anakin Skywalker, Obi-Wan Kenobi, and Ahsoka Tano and the Clone Captain Rex to the planet Onderon train a resistance movement to fight against the Separatist-backed King Sanjay Rash during the Onderonian Civil War. As a result, the Republic established contact with Mina's son Lux Bonteri and the rebel leader Saw Gerrera. Following a prolonged military campaign, the Republic and their Onderonian allies managed to expel the Separatist forces from Onderon and reinstate Ramsis Dendup as King.