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Ham-on-Koom is a town on the edge of the Ramtops, that lies on the Koom. It makes a good living off the river, as fish were in plenty. According to the local

magistrate and coroner (Mr Waynesbury), fish were not the only thing that the river provided[1]. Skulls were washed down, mostly tourists who didn't take sage advice, but some were of more historical interest- dwarf skulls and armour from the most recent battle.

The name of the town is probably a parody on several English towns such as Newark-on-Trent or Newton-on-Ouse.

  1. Thud! p. 371