The Reunited Kingdom in the 4th age takes up most of the area and it is 909,510 square miles according to the Atlas of middle Earth. Rohan is 52,763 sq. miles and the Shire is 21,400 sq. miles. add it all up and ya get most of the West of Middle earth.
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'They say that the One will himself enter into Arda, and heal Men and all the Marring from the beginning to the end."
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