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Roughly speaking, the fairly narrow area between the Desplaines River and the Chicago River in the present City of Chicago, IL, USA represents the divide between the Mississippi River watershed and the Great Lakes watershed. The city was founded because it was a good location to create a canal bridging these two watersheds, and thus, forming an uninterrupted water route from Lake Erie to New Orleans. Today, numerous engineering projects have changed the actual drainage of the city to the point where only a person highly knowledgeable of the city’s public works could tell where a certain drop of rain will end up. The most prominent visual identifier of the divide would be Ridge Avenue on the north side of the city. This road was originally a trail used by Native Americans and is actually a low ridge that was once the ancient shore of Lake Michigan.