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Top Gear is Now Credited on the River Nile Wikipedia Page

BBC Top Gear
In the Africa Special Part 2 episode of Series 19 of the BBC television programme Top Gear, the three presenters (Jeremy Clarkson, Richard Hammond and James May) held a race where the first to find the source would be thought of as the discoverer of the source of the River Nile. The location of the supposed source is suggested to be south west of Lake Victoria, in the Serengeti on a tributary named the Grummeti, on the opposide side of Lake Victoria to where Dr. Burkhart Waldecker (Burundi) and where Joanna Lumley (Rwanda) thought the source was. 
However, this has not been proven, though evidence suggests that this is highly likely by taking into account that the mouth of a river has to flow into a tidal area. The Nile mouth is said to be at Alexandria however this leads out into the Mediterranean Sea which is not tidal meaning that the actual mouth of the Nile is at the Strait of Gibraltar between Spain and Morocco flowing into the Atlantic Ocean. 
Geographically, the source of a river should also be as far away from the mouth as possible. This evidence suggests that the theorem of Dr. Burkhart Waldecker and Joanna Lumley are incorrect and the theory of BBC Top Gear is correct. Though these theorem could all be incorrect as the Top Gear theory has not been proven as the source is the River Nile is still disputed to the present day.
BBC Top Gear