Asteroid archipelago

From Tardis Wiki, the free Doctor Who reference

The asteroid archipelago was located in the Sirius system and contained the Imperial City, the hub of a great trading empire. (AUDIO: The Children of Seth)

It was a region plagued by batworms, which were fought by the Heroes of ancient Gallifrey. After Prydonius publicly denounced the Pythia, the Court of Principals sent him to Funderell on the asteroid archipelago. (PROSE: Cat's Cradle: Time's Crucible)