The Scarus Sector lies spinward of Calixis (together with Ixaniad it's Calixis' closest sector neighbor). The old hive world of Sinophia (Calixian Periphery) was once a hub for ships going to and from Scarus, but in the latter half of M41 most trade lanes bypass the world entirely, going directly from the Malfian sub to Tomish in the Antimar sub over in Scarus Sector.Scarus (and to some extent Ixaniad) are bordered to coreward by the Finial Sector with its many subs. Beyond that lies the Eye of Terror.

To rimward lies subsector Vincies, a region more commonly known as 'Lucky Space' - you'll be lucky to make it out alive. This once-vibrant and heavily settled region was wiped out by a series of extremely violent warp storms in aeons past - so violent that they spilled over in realspace, rather than juts disrupt travel and communications. The warp storms have long since abated and withdrawn, but the remnants of these storms still border the entire region to rimward - creating the vast warp barrier that separate the Koronus Expanse from Imperial space.

The Adeptus Terra has a very strong presence in Scarus sector - in some instances so much that planetary governors are little more that figureheads. It is therefore ironic that Scarus Sector is particularly troubled with heresies of all kinds - rebellion, sedition, mutation, xenos attacks - the Scarus Conclave has it's work cut out for it!