Which Narnia book introduces the wardrobe portal to the magical land?

The Lion, the Witch and the Wardrobe introduces the wardrobe portal to the magical land of Narnia. C.S. Lewis’s novel was published in 1950 and is the first book he wrote in the Chronicles of Narnia series.

The story follows Peter, Susan, Edmund, and Lucy Pevensie, who enter Narnia through a wardrobe while staying in the English countryside during the Second World War. Lucy is the first of the siblings to discover the passage.

Narnia is trapped in the White Witch’s winter, and the children become involved in a conflict centered on Aslan, the Witch, and the restoration of rightful rule. The book’s imaginative structure combines talking animals, mythic elements, and Christian symbolism.

Some editions place The Magician’s Nephew first because it tells an earlier event in Narnian history. Publication order, however, begins with The Lion, the Witch and the Wardrobe, and the wardrobe itself appears in no other opening volume.