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Segmentum Pacificus

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Galactic map of Segmentum Pacificus

The Segmentum Pacificus is one of the five Segmentums into which Imperial dominion of the Galaxy is divided. Its Segmentum Fortress is located at Hydraphur,[1a] ruled by "the Lords of Hydraphur".[1b]


During the Nova Terra Interregnum, the whole of Segmentum Pacificus was claimed by the Ur-Council of Nova Terra.[3] Later thousands of worlds in Segmentum Pacificus were claimed by the Imperium in the Macharian Crusade, but many were subsequently lost in the Macharian Heresy.[4]

In 999.M41, whole swaths of Segmentum Pacificus would suffer from mass uprisings by disgruntled citizens collectively known as the Night of a Thousand Rebellions. Many outlaying planets as well as key worlds such as Darkhold, Minisotira, and Enceladus are swept up in the chaos. Even the Lions Defiant Chapter of Space Marines find their Homeworld the victim of insurgent activity. Since the uprisings began, communication with much of Segmentum Pacificus has been lost.[2]

In M42, Segmentum Pacificus faced an unprecedented threat when the Tyranid Hive Fleet Leviathan launched a massive new offensive into the region. The Imperium found itself initially unprepared, and Imperial heroes such as Lord Commander Solar Arcadian Leontus and Captain-General Trajann Valoris are rallying forces around Sanctum to resist the xenos tide.[6]

Notable Planets

Notable Other Celestial Objects

Notable Sectors and Sub-Sectors

Notable Systems

Other Segmentums