The Slice, a wedge-shaped area of the galaxy, originated at the border of the Core Worlds and stretched through the Colonies, Inner Rim, Expansion Region, Mid Rim, and even the Outer Rim Territories. The Arrowhead, the birthplace of contemporary civilization, marked the Slice's apex. The Perlemian Trade Route and the Corellian Run roughly defined its boundaries. The Slice's systems experienced rapid development as colonists, following these two significant trade routes, migrated into the Slice seeking habitable worlds.
Before a comprehensive galactic map existed, the Slice was portrayed as significantly smaller; sources indicated it encompassed fewer than a thousand settled planets, representing less than 1% of the galaxy. Daniel Wallace, while creating the map, realized these figures were inconsistent with his initial information and ultimately disregarded them.