The Mara River is a river in Africa, flowing through Kenya and Tanzania!
well why is any lake a green or yellow or brown? well that's simple, the simple way to say it is: plants and animals.
the mara river appears to be brown because of the dirt and mud that happens to collect in the river partially from wind or strong tides and waves. it could also be from under water creatures filth...
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In mara Clara the fiends of mara are Gin-gin and Butch.