100 Longest Rivers in the World - with a Map

River: A body of water bearing the same name for its course.

River system: A system which consists of at least two rivers. There are, however, requirements for this:

A river system has been assumed if it has:

1. its source in a lake which is fed by a river of another name (e.g. -> Niagara > Lake Ontario -> St. Lawrence)

2. its source at the confluence of two rivers, then following the longer stem (e.g. Nile, then White Nile stem)

This in return means that a longer tributary joining the main river later somewhere along its way is NOT considered a river system (e.g. Missouri - Mississippi).

For the purposes of this quiz series, we consider dry or half-dry rivers equal to perennial rivers, and their length shows length during flood times.

All headwaters included can be found in quiz stats.

This is the final quiz in this series, thanks for playing along!