Tosste was a location within the Galactic Empire. In describing early Imperial history in his Strategy and Tactics class at the officer's academy on the planet Arkanis, Colonel Julyan taught his students that it was on Tosste that Admiral Terrinald Screed and the Imperial Navy smashed the Iska pirates that they had driven from Fanha.
Tosste was described in the continuity of Star Wars Legends as the planet on which Darth Maul was introduced to the Force. Tosste is only mentioned in passing in canon in Jason Fry's Servants of the Empire: The Secret Academy.