Which is a man made waterway?

Which is a man made waterway? Correct Answer Kiel Canal

The Kiel Canal is a 98 - kilometre - long freshwater canal in the German state of Schleswig - Holstein. The canal was finished in 1895, but later widened, and links the North Sea at Brunsbüttel to the Baltic Sea at Kiel - Holtenau. 
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Which one is not a man made waterway?