Selma Lagerlöf The Amazing Journey of Niels and the Wild Geese Book

Nils Holgerson, punished by an offended gnome, turns into a tiny boy. Finding his faithful friend Martin the goose in his parents' poultry yard, the boy sets off on an adventurous journey to Lapland. Many dangers await Nils, but when you have a good heart and loyal friends, no hardships are terrible. 
Number of pages: 240.