Reaver Territory

The dark frontier where civilization ends and madness rules supreme.

via Wikipedia: Alliance (Firefly) · see source

While the text notes that the Reavers originated from an experiment on the planet Miranda and that they now exist within the system, it does not describe them as controlling a specific territory or operating in a lawless outer rim distinct from Alliance control.

Quick Facts

Primary inhabitants: The Reavers

Lore & Background

In the film 'Serenity', it is revealed that River Tam discovered this truth, specifically that the Alliance's actions led to the creation of the first Reavers. Malcolm Reynolds resolves to reveal this to the universe after a battle with the Operative, thereby revealing the existence of the Reavers and the true nature of the Alliance to the system at large.

Reader's Guide

The only specific threat mentioned in relation to the Reavers is their existence as a result of the Miranda experiment and the subsequent revelation of this fact by Mal Reynolds. The Alliance emerged victorious in the Unification War against the Independent Faction (Browncoats) and secured control over the entirety of the system, but it does not detail how this control applies to areas inhabited by Reavers.