Middle=Earth

Middle-earth is the name used for the habitable parts of Arda. Middle-earth's setting is in a period in Earth's own past. Tolkien, in one of his letters, estimated the end of the Third Age to about 6,000 years before his own time. The action of the books is largely confined to the north-west of the Endor continent, implicitly corresponding to modern-day Europe. The history of Middle-earth is divided into several Ages: The Hobbit and the main text of The Lord of the Rings deal exclusively with events towards the end of the Third Age and conclude at the dawn of the Fourth Age, while The Silmarillion deals mainly with the First Age. The world (Arda) was originally flat but was made round near the end of the Second Age by Eru Ilúvatar, the Creator.