Hasn't this quiz been done before? One correction - the Rio Grande doesn't begin with an R!! It begins with a G. If you use this logic, then every river in the World begins with an R.
ThatOneGuy25, my point is that as "Rio" is just the word for river, then the name of the river is "Grande", which begins with a G. Otherwise, as I said, every river in the World would begin with an "R".