Starbase 307 was a Federation starbase operated by Starfleet in the 24th century.
It orbited Bolarus XIII and was staffed largely by Bolians, though individuals from multiple Federation worlds worked as crewmen. Starbase 307 was rated among the most efficient starbases in Starfleet.
Starbase 307 featured starship construction, starship repair, and research facilities, the latter of which continually expanded on an annual basis. (Last Unicorn RPG module: Planets of the UFP)