The Darpa sector (aka, Ralltiir sector) was in the Ringali Shell in the Core Worlds, along the Perlemian Trade Route. Planets in the sector included Esseles, Ralltiir, and Rhinnal. It once contained the Esselian Empire.
In the years before 4000 BBY, the Darpa sector was ruled by royal families, including the Royal Octans, who gained their wealth as space pirates. The Margrave Octan of Nallastia, and his descendant, the Margravine Quenelle (Skull Queen of Nallastia), were among the prominent posterity of the Royal Octans.
Rebel Alliance operatives in this sector were listed in datapacks recovered from the base on Dankayo. These lists were discovered by a young technician aboard Elusive, an Imperial transport ship en route from Dankayo to Tolan. The Dankayo Rebels reportedly supervised intelligence operations in three sectors. Thus, Ralltiir was presumably one of the three.
- Star Wars: The Old Republic (Mentioned only)
- Episode I Adventures 1: Search for the Lost Jedi
- Episode I Adventures 2: The Bartokk Assassins (Mentioned only)
- Episode I Adventures 3: The Fury of Darth Maul
- Episode I Adventures 4: Jedi Emergency
- Star Wars Adventures 1: Hunt the Sun Runner
- Star Wars Adventures 2: The Cavern of Screaming Skulls (Mentioned only)
- CIS Shadowfeed Dispatch 14:9:15 Edition (Mentioned only)
- "Galaxywide NewsNets"—Star Wars Adventure Journal 3 (Mentioned only)
- "Galaxywide NewsNets"—Star Wars Adventure Journal 8 (Mentioned only)
- Scavenger Hunt (As "Ralltiir Sector") (First appearance)
- "Into the Core Worlds"—Star Wars Adventure Journal 7
- Cynabar's Fantastic Technology: Droids
- The Far Orbit Project
- The Official Star Wars Fact File 7 (PLA2, Planets of the Core Worlds)
- Coruscant and the Core Worlds
- The Complete Star Wars Encyclopedia
- Strongholds of Resistance