The Underland is a fictional location in the children's fantasy series The Chronicles of Narnia by C. S. Lewis. Described by Lewis as lying beneath the land of Narnia, Underland appears mainly in The Silver Chair, where Eustace Scrubb and Jill Pole travel under the ground to reach it in their search for Prince Rilian. They find him in Underland and release him from his enchantment by The Lady of the Green Kirtle.