Boundaries between the continents of Earth Boundaries between the continents of Earth The boundaries between the continents of Earth are generally a matter of geographical convention. Several slightly different conventions are in use. The number of continents is most commonly considered seven but may range as low as four when the Americas and Afro-Eurasia are each considered a single continent. According to the definition of a continent in the strict sense, an island cannot be part of any continent, but by convention and in practice most major islands are associated with a continent. There are three overland boundaries subject to definition: While the isthmus between Asia
Middle-earth Middle-earth Middle-earth is the fictional setting of much of British writer J. R. R. Tolkien's legendarium. The term is equivalent to the term "Midgard" of Norse mythology, describing 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", take place entirely in Middle-earth, and "Middle-earth" has also become a short-hand to refer to the legendarium and Tolkien's fictional take on the world. Within his stories, Tolkien translated the name "Middle-earth" as "Endor" (or sometimes "Endórë") and "Ennor" in the Elvish languages