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In the United States? The biggest river is also the biggest commercial waterway, the Mississippi River. Riverboats, tugs and barges are constantly in motion on the Mississippi. Mark Twain wrote a book called "Life on the Mississippi" in 1880 or so; it is definitely worth reading. It's free online at Gutenberg dot org. The Illinois River is probably in 2nd place.

Aside from the Mississippi, the Great Lakes carry a lot of commercial traffic, including ore carriers, and even ocean-going ships traveling from Chicago through the St. Lawrence Seaway and on to the Atlantic Ocean.

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10y ago

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