The Mirrin sector represented a defined sector situated in the Outer Rim Territories, specifically within the space controlled by the New Republic.
Within its boundaries lay the Mirrin system, a star system that housed the Republic base serving the sector, positioned on the planet Mirrin Prime. Additionally, the sector encompassed the worlds of Suraz 4 and Suraz 5.
The First Order launched an assault in this sector targeting the Yissira Zyde, prompting Rapier Squadron, commanded by Poe Dameron, to intervene.