Starbase Magellan was a Federation starbase in operation by Starfleet in the 24th century, located somewhere in the space of the galaxy's Alpha or Beta Quadrants.
History and specifics[]
In the year 2317, the Federation starship USS Enterprise docked at Starbase Magellan for six weeks before it was launched on another exploration mission. (ST - Tales from the Captain's Table short story: "Iron and Sacrifice")