It was taken from the actual physical world in the Second Age when the Numenoreans attacked Valinor. The world was flat before that, but then it was made round, and there are now "New Lands" in its place that nobody has explored. Now you ask, "how did the Elves get there in the Third Age then?" A very good question. The Valar permitted those ships that they deemed okay to come to Valinor, to somehow pass through the sky and come supernaturaly to Aman. Read the the Akallabeth in the Sil for more info on wy they took Aman from the Circles of the World. Also, the Atlas of Middle Earth by Karen Wynn Fonstad depicts it very well. I'll look and see if I can get a picture of it.
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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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