44. The Nile River in Egypt
The Nile river is a huge river system that runs through Egypt connecting the middle east, Africa, and the Mediterranean all through one river system.
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Beyond the fact that Egypt isn’t doesn’t exactly have the cleanest sewage system (which should be enough to keep you from swimming in it,) the Nile River is also full of crocodiles to the extent that if you lined humans all across the beaches of the Nile, there would be a crock for every human standing there.