"The Wonderful Adventures of Nils" is a children's novel written by Selma Lagerlöf, first published in 1906. The story follows a young boy named Nils Holgersson, who is transformed into a tiny size after mistreating animals. He embarks on a journey across Sweden riding on the back of a goose, learning valuable lessons about kindness and respect for nature. Throughout his adventures, Nils encounters various animals and experiences the beauty of the Swedish landscape. The tale combines elements of fantasy and folklore, showcasing the importance of empathy and understanding. It remains a beloved classic in children's literature.