Rinkitink in Oz: Wherein is Recorded the Perilous Quest of Prince Inga of Pingaree and King Rinkitink in the Magical Isles that Lie Beyond the Borderland of Oz. is the tenth book in the Land of Oz series written by L. Frank Baum. Most of the action takes place on three islands Pingaree, Regos, and Coregos and within the Nome King's caverns. Since the original ruler of the nomes, Roquat