Isle of Naboombu is a book in the 1971 Disney film, Bedknobs and Broomsticks. It's all about the Isle of Naboombu, hence the name of the book. It was in the house Professor Emelius Brown was living in. It now belongs to Paul. By reading it, he believed the actual Isle of Naboombu does exist. It even has the magic words for the Substitutiary Locomotion spell.