Name the 40 rivers, including tributaries, that carry the most water.
Here, rivers are counted by length, not by name. That means if two rivers meet and the resulting stream carries the name of the shorter, both the main river (which includes the longer) and the tributary will have that name. This excludes some named tributaries, but no name appears twice.
Estuaries and headstreams are not included
Data from Wikipedia is poor, the numbers are estimates and not very accurate
Abbreviations: "D" for discharge, "C." for continent, "L" for length