The Discworld Mapp
It was thought that mapping the Discworld would be impossible. Until, of course, a certain person named Stephen Briggs attempted it... and after much continent-shifting and geography-rewriting, the Discworld Mapp was produced.
Opinion: A lovely, well-drawn map which is nice as a poster, and as a reference point while reading. The jigsaw is a smaller version, and, at 60cm square, looks impressive on a wall... nothing better for learning Discworld geography!