The Tosste Spur represented a trade route that departed from the well-known Rimma Trade Route. Located within the Atravis sector's Mustafar system, the Outer Rim Territories planet of Mustafar was integrated into this spur. This connection facilitated the transport of Mustafar's significant mineral wealth to other areas of the galaxy via the Rimma Trade Route.
Within the new Star Wars canon, the Tosste Spur received a mention in the 2015 publication Star Wars: Build the Millennium Falcon 17. Its initial appearance was in the Star Wars Legends continuity, specifically within the 2009 reference work The Essential Atlas, authored by Daniel Wallace and Jason Fry.