The Slough of the Disunited Planets was a location where the Warkeeper lived. The Warkeeper was protected from a horde of enemy creatures by the Hawk troops.
According to the Tenth Doctor, the Disunited Planets "never stopped scrapping, made a radioactive hell of an entire galaxy" and that "any sane space traveller avoids this area like the plague". (COMIC: The Warkeeper's Crown)