Show Longest River The TIle Missouri Mississippi-Missouri generally general general- ly Iy considered one river by hy geographers geographers phen is 18 the longest in the tho world From the tho head fountainhead of tho the Mis Mis- Missouri Missouri sours In the on th the south south- southwest southwest southwest west border of Montana Its total length l is miles From tho source of ol Its Ita other branch at Lake Laka Itasca in northern Minnesota the so-called so Mississippi proper I is 2553 miles autos long The Tha second s ond longest riv riv- river river er or Is Li the Nile 4 miles milc from its Ita remotest headstream the Kagern which flows Into Lako Victoria The Amazon river In South America has the greatest basin basin square miles |