The magical world in C.S. Lewis’s fantasy series is called Narnia.
Narnia is the principal setting of The Chronicles of Narnia, a sequence of seven novels published between 1950 and 1956. It contains talking animals, mythical creatures, human rulers, and landscapes such as forests, rivers, islands, and the great eastern sea. Time can move differently there than in the human world.
The series presents Narnia as a world created by the song of Aslan, the lion who serves as its central spiritual and political figure. Different books focus on different periods in Narnian history, from its creation to its final destruction.
Narnia is often confused with other famous fantasy settings. Middle-earth belongs to J.R.R. Tolkien, Oz belongs to L. Frank Baum, and Westeros belongs to George R.R. Martin. Lewis and Tolkien were friends, but their fictional worlds are separate.