Silver Devastation
The Silver Devastation is found in the Isop Galaxy. According to The Game of Death The Silver Devastation is an rea of space where two galaxies collided. It's a sector of space containing dead stars and dark matter that looks a silvery sea from a distance which led to it's name.
Professor Yana was found in the Silver Devastation, a naked orphan in the storm with nothing except for a strange fob watch. (DW: Utopia)
The Face of Boe was said to be from the Silver Devastation. (DW: The End of the World) However, the revelation that he may in fact be a mutated future form of Jack Harkness might suggest a different homeworld.
In the Darksmith Legacy series of books, book 6 - The Game of Death is centred around an asteriod that shouldn't be in the the middle of the Silver Devastation. This book also gives more history to the origin of the Devastation.