The fictional country at the center of C.S. Lewis’s seven-book series The Chronicles of Narnia is Narnia. Lewis uses the name both for the kingdom and, in a broader sense, for the world containing it.
The series begins with The Lion, the Witch and the Wardrobe, published in 1950. In that story, four English children enter Narnia through a wardrobe and become involved in a conflict involving Aslan, the White Witch, and the restoration of rightful rule.
Narnia is not the only land in Lewis’s imagined universe. The books also include places such as Cair Paravel, Calormen, Archenland, Telmar, and the wild eastern regions reached by sea. The wider world includes multiple countries, islands, and realms connected through magical travel.
Readers sometimes use “Narnia” to mean the entire cosmology of the books, but the term most specifically names the country and its surrounding world. The seven novels together are commonly called The Chronicles of Narnia, although Lewis wrote them over several years and not in story chronology.