Race to the End of the World (The Mapmaker Chronicles #1) (Used Book) - A.L. Tait
A map of the world? Why did the King want that? Everyone knew if you went too far in either direction you'd fall off the edge, into the jaws of Genesi, the fire-breathing dragon.
The King has promised a prize to the ship's captain who can bring him a map of the whole globe. To do that, they'll need mapmakers--and farm boy Quinn is shocked to be one of the chosen.
Quinn is content with his quiet life, but when the King's advisor discovers the special talen he has tried to keep secret, he has no choice but to join the ragtag crew of slaves and stowaways on the Libertas.
On board, Quinn faces the greatest challenges he's ever known--from the strange sea monster hot on thir trail to the other competitors, who will do anything to win. But the greatest danger may be lying in wait. Just off the edge of the map.