Stormcage Containment Facility

Stormcage Containment Facility was a prison planet in the 51st and 52nd century. River Song was a prisoner there. (DW: Flesh and Stone)

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)

She again escaped the Stormcage having been sent a letter by a future version of the Doctor, recruiting her to meet with him in America 2011. The escape's placement is most likely after The Pandorica Opens considering the Vortex manipulator she used in The Pandorica Opens can be seen on her wrist throughout the episode. (DW: The Impossible Astronaut)

Behind the scenes

 * According to an interview with Alex Kingston, she thinks 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.