The Subterrel sector was a sector located in the galaxy's Outer Rim Territories. It contained the Polis Massa system, which was home to a planet of the same name until the world was destroyed in a mysterious cataclysm, leaving behind only an asteroid field.
- Star Wars: Episode III Revenge of the Sith (First appearance)
- Darth Vader (2020) 5
- Darth Vader (2020) 18
- Ultimate Star Wars (First identified as Subterrel sector)
- Star Wars: Build the Millennium Falcon 22 (Guide to the Galaxy: The History of Polis Massa)
- Star Wars: Complete Locations
- Star Wars Helmet Collection 38 (Databank A-Z: Baze Malbus–Darth Maul) (Picture only)