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Ankh (river)
From Discworld & Pratchett Wiki
The Ankh is a river serpenting through the Sto Plains, reaching the Circle Sea by the town of Ankh-Morpork. By then, it can only be called a river because it moves faster than the banks. You can't drown in the Ankh, but it is really easy to suffocate.
Paradoxically, Morporkians are very proud of it. They say "A water that has been filtered by so many kidneys can only be very pure indeed" or "A water so full of life can't be bad for health". Fishes are known to dwell in the Ankh, but they can't be easily observed, because they tend to explode in clear water.
It has been said that the Ankh is the only river in the multiverse where cops can draw a chalk outline when a corpse is found.
