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From Warhammer 40k - Lexicanum
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[[Image:SegGalacticPic.jpg|right]]
The Imperium is divided into five fleet zones known as the ''''Segmentae Majoris''''. Although intended for purposes of fleet administration and shipping controls, the Segmentae have evolved into administrative divisions of the [[Adeptus Terra]].
All shipping is supervised within the jurisdiction of one of the five Segmentae. Each Segmentum has an orbital headquarters called a [[Segmentum Fortress]] which forms the base of fleet operations within the Segmentum. The Segmentum Fortress is controlled directly by a high-ranking official of the [[Administratum]] known as the [[Administratum Master|Master]] of the Segmentum.