Well, there isn't much more to say... Why did Tolkien name Middle-earth "Middle-earth"? It must be because it is the main part of the earth, though not necessarily the only part. Middle-earth is not the whole globe. Tolkien did not say that the Elves sailed across the sea forever just to end up on the other side of Middle-earth or something. They sailed to another continent. If you read The Silmarillion, it says that practically all except Ulmo and Melkor and his minions left Middle-earth at one point. Ulmo (the sea), you see, was between them and Middle-earth.
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