The Siskeen theater represents a specific operational zone within the Outer Rim Sieges. These sieges unfolded during the concluding phases of the Clone Wars, and this theater was one of six such zones.
Situated within the Outer Rim Territories, the Siskeen theater lay adjacent to the Corellian Run. The name of this operational area originated from the significant Separatist planet known as Siskeen.
Within the boundaries of the Siskeen theater, Republic military units were dispatched from both Rothana and Excarga. Their mission was to eliminate Separatist presences along the outer reaches of the Corellian Run.