The Shoal was an asteroid on which the Vore originated. (PROSE: The Gallifrey Chronicles)
According to Pike Thornton, a number of people moved from Shoal, Brimstone and Johannem to Legion in order to work in the mines before they ran dry. (AUDIO: The Brimstone Kid)
Sometime after the 27th century, the Deindum built a shipyard at the then resource-rich Shoal. The complex they built was larger than most solar systems, and it consisted of a hundred planet-sized factory stations. (PROSE: Winging It)
The Shoal was the site of a temporal cicatrix. Larna was sent by the Time Lords to gather information about it. However, Marnal, a Time Lord from her relative past, destroyed the Shoal by detonating explosives. (PROSE: The Gallifrey Chronicles)