Hidden in an old copy of The Lord of the Rings, a U.K. rare book store has found a map of Middle-earth annotated by J.R.R. Tolkien himself. The map, found in a book given to Blackwell's Rare Books ...

Earth being flat might just be a conspiracy, but in Lord of the Rings, a flat earth was just a fact at one point in Middle-earth history.

With a circumference of about 40,075 kilometers, the Earth’s curvature is spread out over such a vast area that it’s nearly impossible to detect at ground level.

Therefore, most of Beleriand only exists on some maps of Middle-earth. The maps in question are the earlier ones, since most of Beleriand had disappeared by the time of Jackson's Lord of the Rings.