A natural rift into five-dimensional space that connected two fixed locations, a wormhole was the normal means of faster-than-light, interstellar spaceflight in the Vorkosigan Saga. They were sufficiently common and close together in the galaxy as to create a Nexus of reachable systems.
Some systems had only one usable wormhole, such as Barrayar, Aslund, and Athos; others had as many as six, as in the case of Kline Station and the planet of Komarr, which was settled for its abundance of wormholes in local space.
For a discussion of technology associated with wormhole jumping, see jump technology. See Nexus for a listing of major routes.