The Sil'Lume asteroid belt, part of the Outer Rim Territories' Seitia sector, was an asteroid belt.
For the purposes of mining and various other endeavors, more than 800,000 asteroids were officially recorded and designated as property, among them 24 Tredway, 40,005 Milton, and 400,324 Henryson.
Luke Skywalker journeyed to the Sil'Lume asteroid belt during the Yavin blockade, in order to assess whether it could serve as a future Rebel headquarters.