The Kalki Nebula, a nebula, existed within the Cassander sector, which itself was situated in the Trans-Hydian Borderlands area. The Resistance gunner Paige Tico noted in her journal circa 34 ABY that pirates had been constructing strongholds within the nebula across numerous centuries, thereby enabling them to coordinate quick strikes against adjacent star systems.
Within the new Star Wars canon, the Kalki Nebula initially appeared in The Last Jedi: Bomber Command, a replica journal book released in 2017 and penned by Jason Fry. Before this, the nebula debuted in the Star Wars Legends continuity via the 2004 Geonosis and the Outer Rim Worlds sourcebook from Wizards of the Coast.