The kingdom of Lancre is situated in the Ramtop mountains. Although most maps show Lancre to measure roughly 40 miles by 10 miles in size, its true area remains unknown, due to its mountainous terrain and high level of background magic.
The Ramtops are a major earthing point for the Discworld's magical field. Lancre is famous for witches, especially since the publication of The Joye of Snackes (an erotic cookbook) by "A Lancre Witch", i.e. Nanny Ogg. Lancre also contains a gateway into the "parasite universe" of the elves.