A grouping of systems forming a chain of worlds all reachable by jump-1. This grouping provides a sort of "corridor" allowing jump-1 capable ships to travel to any world along the chain.
Many such groupings of worlds exist in the Imperium. Prominent examples include the Spinward Main in the Spinward Marches, the Vilani Main centred in the Vland sector, the Sylean Main in Core sector, and the Antares Main originating in the Antares sector.
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