When the Elves "sailed off into the West" they were returning to Aman, the Undying Lands, which are west of Middle Earth. Kind of amazing how that works, ain't it? Tolkien's ME was connected to Aman by the Helcaraxe ( The Grinding Ice ) that the rest of the Noldor crossed when Feanor burned the ships of the Teleri after crossing from Aman. Numenor lay between them.
Tolkien never says whether there are any lands on the other side of the world, that I know of.
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Middle-earth: Insanity
"What, the peons aren't trusted?" -- Yazoo, Final Fantasy VII: Advent Children
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