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River Smarl
From Discworld & Pratchett Wiki
Mentioned in The Light Fantastic, this is the Disc's longest river. It rises near the Hub and winds down the turnwise side of the Ramtops to the Circle Sea in the region of Istanzia, rimward of the Morpork Mountains. One might expect a great sea and river port at the mouth of the continent's major river, but the area is near wilderness.
