"Middle-Earth", or _Endor_, initially describes all the lands between _Aman_ in the West and the _Lands of the Sun_ in the East.

[![enter image description here][1]][1]

This particular geography would only last until the Elves are discovered and the Valar fight the Second Great Battle against Melkor. After the battle, "Middle-Earth" is used to refer only to the Northern parts of the continent. The Southern part is called the "Hither Lands" and is rarely referred to.

[![enter image description here][2]][2]


  [1]: https://i.sstatic.net/i30lK.jpg
  [2]: https://i.sstatic.net/GckQP.jpg