Hydraphur: The planet in the Segmentum Pacificus which houses the Segmentum Fortress for the Western Imperium. The Master of the Segmentum lodges there, and it forms the formal headquarters for the Warfleet Pacificus, Merchant Pacificus and Civilis Pacificus fleets.
All Charters for the Segmentum are registered on Hydraphur
Source: White Dwarf: Issue 140 by various
Submitter: Simguinus
Hive World Terra