Who knew? Maybe you did. The Mississippi River basin is bigger than I ever imagined. I should have known. I know one cruiser who took a Great Loop detour to visit West Virginia; another piloted his deep draft sailboat to Oklahoma City. Connecting those dots, obviously one can navigate from West Virginia to Oklahoma through the "veins of America." 

Rivermap

Here's what Britain's Daily Mail news outlet said about the above river map:

Created by Imgur user Fejetlenfej, a geographer and GIS analyst with a "lifelong passion for beautiful maps," it highlights the massive expanse of river basins across the country – in particular, those which feed the Mississippi River. The map visualizes Strahler Stream Order Classification, the creator explains, with higher stream orders indicated as thicker lines. 

Imgur, I was to learn, is a site where GIFs for social media are posted. That is, among other things, many very short cat animations. Etsy is an online shop that will sell you a high-resolution version of the map for eight bucks. 

Watch this NASA animation showing the sources of the Mississippi

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