Osou, situated on the Outer Rim Territories planet of Genbara, was a notable urban center. The primary spaceport for Genbara, known as the Osou spaceport, was located within Osou.
The city of Osou was initially introduced in Ronin: A Visions Novel. This 2021 novel, penned by Emma Mieko Candon, delves deeper into the universe established in the Star Wars: Visions short film, "The Duel."