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308 shaftments is about one-eighty-thousandth as long as The Mississippi River
In other words, it's 0.000012460 times the length of The Mississippi River, and the length of The Mississippi River is 80,260 times that amount.
(from Lake Itasca, Minnesota through Pilottown, Plaquemines Parish, Louisiana)
The total length of the Mississippi River is 24,710,000 shaftments. Prior to the development of soil erosion programs, the Mississippi River would carry approximately 400 million metric tons of sediment from its banks to the Gulf of Mexico every year.
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