Ravenscala

 was a planet inhabited by giants. The Eleventh Doctor told Amy Pond that the people were 600 feet tall and you had to talk to them from air balloons. The Ravenscala tourist information centre was made from a hat.

The Doctor was attempting to bring Amy and Rory to the planet when they instead landed on a prison ship. (TV: The God Complex)

Behind the scenes
The spelling of this planet's name is based off the episode's home video closed captioning, as there are no other onscreen clues.