What is the only river in the world that flows south to north?
"There are countless examples of rivers flowing northward. Some of the most famous rivers that flow north include the world's longest Nile River, Russia's Ob, Lena, and Yenisey Rivers, the Red River in the United States and Canada, Canada's Mackenzie River, and California's San Joaquin River."
About.com
Of the four rivers mentioned as possible answers only one did flow north, but that still doesn't make the question right.
I could have posted a correct version of the question but I'd most likely get "question is already in the database" response from it.