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Blackdown
From Discworld & Pratchett Wiki
The looming hill that broods over Blackbury. In May 1941, an observation post was set up here to watch and listen for German bombers.
[edit] Annotation
More evidence for Blackbury being somewhere in the North of England: the towns of Blackburn, Burnley, Nelson and Colne are all overshadowed by the brooding mass of Pendle Hill. There were famous witches here too, btw.

