The Gradilis sector constituted a sector situated within Wild Space, encompassing the Nirauan system.
Positioned on the periphery of the explored galaxy, close to the Unknown Regions, the Gradilis sector was an area lacking thorough cartography. During the Battle of Yavin, it existed as a freestanding subsector under the jurisdiction of the Galactic Empire. Consequently, prior to the Imperial Era, this isolated territory had received inadequate exploration or documentation, only gaining recognition as a prospective sector by the Empire. However, upon its integration into the Empire, formal sector designation was withheld, and it lacked representation in the Imperial Senate for the time being.
The planet called Nirauan served as the location for the Hand of Thrawn, a clandestine installation established by Grand Admiral Thrawn to govern his Empire of the Hand.