The Western Orion Arm was a name for a group of planets linked relatively closely together in the wormhole Nexus. It had Tau Ceti at its hub, with Earth and Lairouba as two other members. The group was known to hold meetings on Earth to arrange right-of-passage agreements. Komarr was not in the group, but two routes from there connected to it; therefore the Komarrans (and Barrayarans) took an interest in these meetings and attended when possible.