Númenor, also called Elenna-nórë or Westernesse, is a fictional place in J. R. R. Tolkien's writings. It was the kingdom occupying a large island to the west of Middle-earth, the main setting of Tolkien's writings, and was the greatest civilization of Men. However, after centuries of prosperity many of the inhabitants ceased to worship the One God, Eru Ilúvatar, and rebelled against the Valar, resulting in the destruction of the island and the death of most of its people. Tolkien intended Númenor to allude to the legendary Atlantis. Commentators have noted that the destruction of Númenor echoes the Biblical stories of the fall of man and the destruction of Sodom and Gomorrah, and John Milton's Paradise Lost.

Middle-earth is the setting of much of the English writer J. R. R. Tolkien's fantasy. The term is equivalent to the Miðgarðr of Norse mythology and Middangeard in Old English works, including Beowulf. Middle-earth is the human-inhabited world, that is, the central continent of the Earth, in Tolkien's imagined mythological past. Tolkien's most widely read works, The Hobbit and The Lord of the Rings, are set entirely in Middle-earth. "Middle-earth" has also become a short-hand term for Tolkien's legendarium, his large body of fantasy writings, and for the entirety of his fictional world.