Stormcage Containment Facility
Template:Infobox Organization Stormcage Containment Facility was a prison in the 51st and 52nd century. River Song was a prisoner there. (Template:DW)
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 Storm Cage, 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 Storm Cage, 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.