There was a Yellow Nile and it is a former tributary that connected the Ouaddaï Highlands of eastern Chad to the Nile River Valley about 10,000 years ago. It is now known as Wadi Howar and meets up...
if pee is clear that usually means you have been drinking a lot of water but if its VERY yellow you need to start drinking more water so that its not only very yellow but can clean your "insides"...