From Halopedia, the Halo wiki
The Grenadi sector is a sector of the Unified Earth Government, located among the Outer Colonies. On the frontier of human space, notable locations within the sector include the Little Nelek Nebula and the human colony of Amasa.
With the start of the Human-Covenant War, the Grenadi sector was one of the first sectors targeted by the Covenant, alongside the Polona and Vevina sector. The Covenant's fleets glassed numerous human worlds within the sector, with several of these campaigns being led by Fleetmaster Nizat 'Kvarosee and his Fleet of Inexorable Obedience. The colony of Amasa in the Grenadi sector was the tenth target in 'Kvarosee's campaign against humanity.
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