Sky Island

"Sky Island" is indeed a novel written by L. Frank Baum, published in 1912. It is the sequel to Baum's earlier work "The Sea Fairies" and is part of his "Oz" series, though it is not set in the Land of Oz.

In "Sky Island," two children named Trot and Cap'n Bill embark on a fantastical adventure to a mysterious island floating high above the clouds. On this island they encounter a variety of strange creatures and encounter numerous obstacles as they navigate the magical landscape. The novel combines elements of fantasy, adventure, and whimsical storytelling that are characteristic of Baum's writing style.

While "Sky Island" is not as well-known as Baum's "Wizard of Oz" books, it remains a beloved classic among fans of his work and is appreciated for its imaginative world-building and charming characters.