Stormcage Containment Facility

Stormcage Containment Facility was a prison planet in the 51st and 52nd century. River Song was a prisoner there. 

In the 52nd Century, River escaped Stormcage to warn the Doctor about the Pandorica opening. (DW: The Pandorica Opens) For reasons that are, as of yet, unknown, River returned to Stormcage in the 51st Century, and was later released under the custody of Father Octavian, who needed her assistance in a mission involving Weeping Angels. When their mission was over, River was presumably returned to Stormcage, though she did hope she had earned a pardon through her actions. (DW: The Time of Angels/Flesh and Stone).

Behind the scenes

 * According to an interview with Alex Kingston, the Stormcage is some kind of a prison planet and it is particularly unpleasant to stay there. Through the window of River's cell heavy rain can be seen. Perhaps the oppressive nature of the weather is the source of Stormcage's name.