<page_title> List of rivers by length </page_title> <section_title> List of rivers longer than 1000 km </section_title> <table> <cell> 4. <col_header>  </col_header> </cell> <cell> Mississippi–Missouri–Jefferson–Beaverhead–Red Rock–Hell Roaring <col_header> River </col_header> </cell> </table>
The Missouri River is the fourth longest river system.