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Science-Fiction Adventure in the Far Future
Spinward Main

Within the Spinward Marches, a grouping of star systems within jump-1 of each other. Together, this grouping forms a corridor of jump points (a jump route) which allows simple jump-1 ships to travel to 15 of the 16 subsectors within the Marches, and to 223 of the 440 worlds.

Ref: ADV-3, 1106