Map of the Tamagawa-josui canal, a 43-kilometer aqueduct/canal running from Western Tokyo to the center. It is referenced in the following posts:

See: Walking on water: the underground rivers of Tokyo 東京の地下河川や運河の地図

See: ClearWater Nippon & splashing around Tokyo’s water infrastructure

See: The Kodaira Referendum: fighting for Democracy in the Acorn Forest