The fictional land visited through a wardrobe in C.S. Lewis's most famous children's series is Narnia.
Narnia is the central setting of The Chronicles of Narnia, a seven-book sequence published between 1950 and 1956. The first published volume, The Lion, the Witch and the Wardrobe, introduces Narnia when Lucy Pevensie steps through a wardrobe and finds a snow-covered world ruled by the White Witch.
Lewis presents Narnia as a world with its own talking animals, kings, queens, magical creatures, and historical eras. Aslan, a great lion, is its most important recurring figure. Readers sometimes call the wardrobe itself Narnia, but the wardrobe is only the portal; Narnia is the destination. The series also includes places such as Calormen, Archenland, and the eastern sea, expanding the geography beyond the first book's setting.