Original: Earthsea became the setting for a further six books, beginning with A Wizard of Earthsea, first published in 1968, and continuing with The Tombs of Atuan, The Farthest Shore, Tehanu, Tales from Earthsea and The Other Wind.
Simplified: 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.