 The five areas into which the Voids separate the inhabitable portions of the galaxy are the Alpha Octant, the Sargasso Octant, the Xorkaelian Empire, the Sigma Octant, and the Omega Octant.The Alpha Octant is the primary setting of the Star Fleet Universe, being home to the United Federation of Planets, the Klingon Empire, the Romulan Star Empire, and all the other empires inherited from other "Star Trek" settings.It extends from the Alpha Sector to the Delta Sector, but only Alpha, Beta and Gamma (more specifically, the area covered by the "Federation and Empire") have been extensively explored by the major powers of the region.