Death's Domain

Blurb

Death's Domain is a book by Terry Pratchett and Stephen Briggs, illustrated by Paul Kidby, fourth in the Discworld Mapp series. It was first published in paperback by Corgi in 1999. It was the second in the series to be illustrated by Kidby. As with the other "mapps," the basic design and booklet were compiled by Pratchett and Briggs.
The Mapp shows the parasite universe of Death's Domain. The accompanying booklet provides various details of the Domain, both as portrayed in the Discworld books and newly revealed.
In Death's Domain, the concept of steam locomotives on Discworld is introduced, which became the main theme of Pratchett's Discworld novel Raising Steam fourteen years later.