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[[Image:galaxy_map_ultimasegmentum.jpg|thumb|right|300px|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]].