"Penultima Thule", Chris Willrich

NT F&SF (Fantasy & Science Fiction) AUG 2006 - fantasy
A thieving couple, Persimmon Gaunt and Imago Bone, take a "cacography" book to the northern rim of their flat world to throw it off the edge. This book, Mashed Rags Bound in Dead Cow, is so magically malicious that reading it is fatal, sort of like Monty Python's Killer Joke. In the far North, Gaunt and Bone encounter Stonekin, Hunger Stones, and Tornarssuk, which are tool-using polar bears.

A strange, but imaginatively strange, fantasy trek. Apparently previous stories have featured these characters.