posted by Jeconiah .
what is the longest river in the world?
Math (?) -
How is this math?
Since this is not my area of expertise, I searched Google under the key words "longest river in the world" to get these possible sources:
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.