Geonosis was a desert planet located in the Outer Rim that allied itself with the Separatists during the Clone Wars. Geonosis is known where The Clone Wars first started.
Geonosis was a harsh, rocky world. With a brutal climate and vast, humid deserts coated in shades of red. The planet was also known to have 15 moons and also be populated by Geonosians, a sentient insectoid species.
During the Clone Wars, Geonosis was the location of many droid factories for the Separatist Alliance. Due to this influential role in the war, many battles were fought on the planet.
Later, after the Republic devolved into the Galactic Empire, most Geonosians were killed in a genocidal attack on their world with bombs and other weapons, after the Empire failed to mine the planet's minerals.
An Imperial construction yard was established in orbit around Geonosis, but abandoned by the time the crew of the Ghost arrived in the system after the Imperial attack on Garel. Here they were ambushed by an Imperial force under Agent Kallus of the Imperial Security Bureau, but managed to escape, with Kallus and Garazeb Orrelios ending up stranded on one of Geonosis' moons after their battle carried into an escape pod. The Geonosis Moon in which they were stranded possessed a colder climate to that of the main planet, Geonosis.
- "The Honorable Ones" (First appearance)