Ultima Segmentum
The Ultima Segmentum is home to many worlds as it is the largest segmentum in the Imperium. It contains the Ultramarines empire of Ultramar. The Segmentum Naval Base is Kar Duniash.
It has seen attacks by two separate Tyranid Hive Fleets, Behemoth and Kraken. It also contains the persistent warp storm known as the Storm of the Emperor's Wrath. It also contains the Maelstrom, a warp-real space convergence much like the Eye of Terror, but on a smaller scale. The Maelstrom harbours various piratical renegades who use it to launch raids from.
It contains many notable Imperial planets, including:
It also contains various alien worlds, including:
The world of Gorkamorka (Angelis) is located to the North East of the segmentum, within a region of space known as the Ghoul Stars. These are not formally part of the Imperium, but can be classed as being part of Ultima Segmentum due to their proximity to it.
Lesser Known worlds include:
Other Segmentae Majoris
- Segmentum Tempestus - South West
- Segmentum Solar - West
- Segmentum Obscurus - North West
- Segmentum Pacificus - Far West
