The Seswenna sector was a sector situated within the Outer Rim Territories of the galaxy. This sector was notable for encompassing the planet Eriadu, as well as Seswenna; furthermore, the Hydian Way and the Rimma Trade Route passed through it. During 228 BBY, the Nihil marauders caused an expansion of the Stormwall, resulting in a portion of the sector being incorporated into the Occlusion Zone.