Segmentum Tempestus

 Segmentum Tempestus is the region of Imperial space South of Segmentum Solar. The fleet headquarters in the Segmentum is Bakka.

Sectors
The sectors and notable places in Segmentum Tempestus are:
 * Unknown Sector
 * The Planet Banelund XI, the Imperial Colony was attacked by Dark Eldar, slaying all 1,200 colonists. Site of Eldar warp portal artifact.
 * The Planet Danubis, a Dead Planet. Visited by Explorator vessel Lux Imperator, which disappears (later found in Polonis nebula with no crew). Possible Necron lair.
 * The Planet Krieg, where the Autarch declared independence from the Emperor. Colonel Jurten uses atomic cleansing to subdue rebellion, turning Krieg into a toxic, ash polluted wasteland for 500 years. Home of the Imperial Guard Krieg Death Corps.
 * The Planet Luther Mcintyre IX, a Desert world. Home of Ambulls, Crawlers, Sunworms, and Micah dragons.
 * The Planet Solstice, notable for the victory of Uriah Jacobus over a Genestealer cult.
 * Tethrock Quay Imperial Naval Outpost. Reports of increasing Necron activity.
 * The Planet Chamos. A rebellion led by Duke Mormant in 35th millenium. 10 light years from Tallarn.
 * The Planet Tallarn
 * The Planet Gryphonne IV, a Forge World.
 * The Planet Posul the home to the Mortifactors Chapter of the Space Marines.
 * The Planet Kiavhr a Forge World, and the planet around which Deliverance, the base of the Raven Guard Chapter, is located.
 * The Garon Nebula, which is close to Ork empire of Octavius.
 * Spartus Sector
 * The Plenet Jericho III, The Dark Eldar destroy the capital, killing over 20,000 inhabitants.
 * The Planet Stratix, a Forge World. Raiding Dark Eldar raid polar arsenal, steal experimental military hardware. An Imperial Guard recruit world.
 * The Planet Vistro an Imperial Convoy en route to Vistro is attacked by Dark Eldar, taking ore and destroying several ships.
 * Loki Sector
 * The Planet Rynn's World, an Agri World. The homeworld of the Crimson Fists Chapter of the Space Marines.
 * The Planet Badlanding, an Agri World. Invaded by Ork Warboss Uzrog, under the orders of Snagrod, the Arch-arsonist of Charadon.
 * Orpheus Sector
 * The Planet Sanctus Prima. Planetary Cardinal urges "War of Faith" against all aliens in the Orpheus Sector. The Biel Tan craftworld in the area hope to avoid the war by fighting the Dark Eldar, but Dark Eldar break through and attack Imperial forces.
 * The Planet Kurzon's Fall, an Imperial Jungle world. Dark Eldar attacks prompt the Cardinal of neigboring Sanctus  Prima to urge for War of Faith against all aliens in the Orpheus Sector.
 * Coptis Sector
 * The Planet Karis Cephalon, an Imperial world and the site of an astrological convergence. Mutant slave labor trade broken up by Inquisitor Tyrus.  "The Angel" a weapon from Dark Age of technology is hidden in catacombs under the Amethyst Palace, the world's capital, which is centered around pre-Imperial construct known as Needle of Sennamis (possible psychic conductor). Settled during golden age, resettled during Great Crusade [350.M30]. 5.3K light years from Earth.

The Segmentum also contains the following: Also the Biel Tan craftworld. It is most famous for its participation in the battles against Hive Fleet Leviathan.
 * Ork Homeworlds
 * The Planet V'run
 * The Planet Epsion Octarius, center of a ring of planets lost to hive fleet Leviathan.
 * The Planet Jurn.