The fictional land invented by C.S. Lewis and his brother Warren during childhood was called Boxen.
Lewis and Warren created Boxen as part of their private imaginative games while growing up in Belfast. They developed stories, maps, histories, and political events for the invented world, which combined animal characters with ideas drawn from the books they read. The project shows how early Lewis’s interest in constructed worlds and narrative history had become.
Boxen should not be confused with Narnia, the fantasy world Lewis created for his published children’s novels decades later. Narnia has talking animals and human visitors, but it is a separate fictional universe with its own creation story, geography, and chronology.
Some of the Boxen material survived in manuscripts and was edited for publication after Lewis’s death. The childhood project is valuable to biographers because it reveals Lewis experimenting with world-building long before The Chronicles of Narnia.