I am pretty new to Discworld. (I've read "the Colour of Magic," and I just started "The Light Fantastic.") I want a good map, to help my mind wrap around the weird geography. On Amazon, there are two options, (listed in the title.) The Mapp is cheaper, but comes with less stuff. The atlas is already more expensive, but since they have to ship it overseas, there's an extra ten bucks for shipping. Is it worth it to get the atlas, or should I go with the map?