Exodus First

Exodus-First is the region of space between the Mid-Rim and the famous Frontier-Last region. This region was the site of the first exodus of the Antillian Federation, that is, the first major movement of Colonists since the Antillian Imperium was brought down. The name stuck and subsequently the region was crowned "Exodus-First", in light of the other similar names (having -First or -Last after the first word etc)

Exodus-First has 121 Sector Councils in it's region, because of it rather sparse population, as there are many colonies around this region that have much smaller populations and densities than regions such as the Mid-Rim, and considerably smaller to the Inner regions.