Segmentum

Each Segmentum has its own Imperial Navy and Merchant Fleets, as well as a Segmentum Fortress or Segmentum Naval Base that forms the base of fleet operations within the Segmentum. The Segmentum fleet commanders are known as the Lord High Admirals. The Segmentum Fortress is controlled directly by a high-ranking official of the Administratum known as the Master of the Segmentum.

Although intended for purposes of fleet administration and shipping controls, the Segmentae have evolved into administrative divisions of the Adeptus Terra.

The Segmentae Majoris and their fortresses are:

Segmentum	Zone	Base
Segmentum Solar	Centre	Mars
Segmentum Obscurus	North	Cypra Mundi
Segmentum Pacificus	West	Hydraphur
Ultima Segmentum	East	Kar Duniash
Segmentum Tempestus	South	Bakka