Middle+Earth

The Middle Earth is the entire world of the Hobbit. Everything that is, is from - meaning people or places- the Middle Earth. All places, ex. Greenwood, are from Middle Earth and all people, hobbits, dwarves, elves, etc. live on the Middle Earth but in towns like ex. Greenwood. It's like what would be to us the Earth, everything is on it or from it, it is our world and the Middle Earth is theirs.