Which Terry Pratchet novel was this quote taken from?

“It’s been here a long time,” said Granny.
“So’s everywhere,” said Nanny, and added, with the air of a lifetime student, “Everywhere’s been where it is ever since it was first put there. It’s called Geography.”
“That’s just about land,” said Granny. “It’s not the same as a kingdom. A kingdom is made up of all sorts of things. Ideas. Loyalties. Memories. It all sort of exists together. And then all these things create some kind of life. Not a body kind of life, more like a living idea. Made up of everything that’s alive and what they’re thinking. And what the people before them thought.”

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