The Gradilis sector was a sector in Wild Space that contained the Nirauan system.
The Gradilis sector was a poorly charted area located on the edge of the known galaxy, near the Unknown Regions. It was a freestanding subsector of the Galactic Empire at the time of the Battle of Yavin. This meant that this remote area was poorly explored or insufficiently documented before the Imperial period and was only recognized as a potential sector by the Empire. Yet, the region was not given a formal sector status when incorporated into Imperial Space and was not represented in the Imperial Senate for the time being.
The planet Nirauan was the location of the Hand of Thrawn, a secret base established by Grand Admiral Thrawn to rule his Empire of the Hand.
- The Complete Star Wars Encyclopedia