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The Great Nef, first mentioned in The Colour of Magic is an incredibly dry desert , to the point it has negative rainfall. The Great Nef is home to the Dehydrated Ocean, which consists of water in an uncommon fourth state (it dehydrates, leaving a silvery mildew-like free­flowing sand), and Light Dams, which dam up and save the Discworld's slow-moving, syrup-like light.

Nef is "fen" (swamp) backwards, an entirely appropriate name for a desert.

[edit] Annotation

Is this a Roundworld reference to the Grand Erg in the Sahara?

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