The Neverending Story by Michael Ende

Unicorns, dragons, sprites: the inhabitants of an enchanted world. And into this world - through the pages of an old book - ventures Bastian, a lonely boy of ten or twelve. But Fantastica is slowly decaying, its Childlike Empress dying. Only a real human being can set things right by giving the Empress a new name. Bastian takes up the challenge, and finds himself crossing the Swamps of Sadness and the Silver Mountains, meeting sorcerers and giants, bats and night-hobs, gnomes and racing snails, as he journeys bravely forward, Bastian's quest is filled with all the wonders of myth and fairy tale.

Penguin Books 1984 edition in great condition.