Ruusan was a plane located in the Ruusan system within the Teraab sector of the galaxy’s Mid Rim that was orbited by three moons. It was positioned at the coordinates P-11 of the Standard Galactic Grid.

Ruusan was the site of the final defeat of the Sith at the end of the Jedi-Sith War. It was host to a number of ancient relics, strewn across its many historical battlefields. Following the defeat of the Sith, Form II “Makashi” fell out of fashion in the Jedi Order and was gradually seen as a mere training exercise. A room in the Jedi Temple on Coruscant was decorated with stained glass windows, one of which depicted one of the battles on Ruusan.