Earthsea is a fictional place made by Ursula K. Le Guin for her short story "The Word of Unbinding" in 1964, but that became more famous in her book "A Wizard of Earthsea", first written in 1968. The books that follow "A Wizard of Earthsea" are "The Tombs of Atuan", "The Farthest Shore", "Tehanu", "Tales from Earthsea" and "The Other Wind". These are all set in the world of Earthsea