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Show Longest River The Mississippi-Missouri, general-ly general-ly considered one river by geographers, geogra-phers, is the longest in the world. From the fountain-head of the Missouri, Mis-souri, in the Rockies on the southwest south-west border of Montana, it3 total length is 4,221 miles. From the source of its other branch at Lake Itasca in northern Minnesota, the so-called Mississippi proper is 2,553 miles long. The second longest river riv-er is the Nile, 4,000 miles from its remotest headstream, the Kagera, which flows into Lake Victoria. The Amazon river in South America has the greatest basin 2,772,000 square miles. |