Geonosis, referred to as Geonosia by some natives, is a rocky planet home of the Geonosian race, The planet served as the first CIS capital and two major droid foundries in the Star Wars universe. The construction of the first Death Star started there.
The Geonosians that inhabited the planet were a type of human-sized insectoid that lived in hives. The Geonosians were themselves divided into castes including winged warriors and wingless workers. The planet was governed by the combined might of the Geonosian queen, Karina the Great and her advisor, Archduke Poggle the Lesser. Karina governed the planet through the use of Brain Worms that were connected to her via hive-mind. As such her control of the planet and her people was absolute; indeed her mind control was so strong that the Geonosians infected with her Brain Worms were able to continue functioning even after they had died.
During the Clone Wars, Geonosis was a part of the Confederacy of Independent Systems, and was the supplier for most of the Confederacy's Battle Droids as well as the original mastermind for the creation of the Death Star. It was the site of several battles during the war, and due to Queen Karina's power, had to be taken twice in order to successfully be neutralized as a threat. After Karina's death at the hands of Obi-Wan Kenobi and Anakin Skywalker, Poggle took control as Geonosis' de-facto leader. When the Galactic Empire rose and Anakin Skywalker became Darth Vader, Poggle the Lesser was killed personally by Vader on Mustafar with the other Separatist leaders. After his death, the Empire first utilized the Geonosians as slaves and then sterilized Geonosis with an orbital bombardment after moving the Death Star away to a new location, wiping out all but one queen to keep the construction of the Death Star above the planet a secret. Vader would later encounter this queen on a secret mission to the planet and take her BX Droid Commandos for his own personal use. As she was the last of her kind and unable to beget offspring, Vader left her alive as punishment and to remind her that she was completely alone.
Places of Interest
Geonosis Droid Foundries
The Geonosis Droid Foundries was a massive subterranean droid factories located on the planet. Most were destroyed save for one found by Darth Vader, which he took for his own personal use to create BX Droid Commandos.
The Petranaki Arena (or Arena of Justice) is a large arena on Geonosis and is a place where they use deadly beasts in combat and for the executions. Such beasts used in the arena included the Nexu, Reek and Acklay among others.