The Nanjing Inverted Siphon, part of the North Main Line of the Taiwan National Greenway, is located in Shuishang Township, Chiayi County. It connects to the Nanjing Cycling Path and offers visitors the unique view of trains passing by.

When irrigation channels intersect with roads or rivers at nearly the same elevation, a hydraulic structure is required to allow water to pass beneath the surface. This structure is commonly known as an inverted siphon.