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Student Loan Debt wrote:

A lot of rivers flow from the south to the north. I think this is from a concept people have that north = up when that's not true. River just flow downhill and elevation doesn't really have much to do with cardinal directions

AFAIK, most northward flowing rivers are in rural areas, incl. Siberia, Canada, or a Colombian/Guyanese jungle. The Nile is therefore the only one associated with a large human population living on its banks, this makes it seem from a human habitation perspective that they are rare. (I'm Social Studies teacher)