Original: Earthsea is a fictional realm originally created by Ursula K. Le Guin for her short story "The Word of Unbinding", published in 1964.
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.