Chicago Sanitary and Ship Canal

The Chicago Sanitary and Ship Canal, historically known as the Chicago Drainage Canal, is a 32-mile-long (51 km) canal system that connects the Chicago River to the Des Plaines River in Northeast Illinois, US. It reverses the direction of the Main Stem and the South Branch of the Chicago River, which now flows out of Lake Michigan rather than into it. The related Calumet-Sag Channel does the same for the Calumet River, 10 miles to the south, joining the Chicago canal about halfway along its route to the Des Plaines River.

Source: Wikipedia — Chicago Sanitary and Ship Canal (CC BY-SA 4.0)