<P> The Bahr al Ghazal and the Sobat River are the two most important tributaries of the White Nile in terms of discharge . </P> <P> The Bahr al Ghazal's drainage basin is the largest of any of the Nile's sub-basins, measuring 520,000 square kilometers (200,000 sq mi) in size, but it contributes a relatively small amount of water, about 2 m / s (71 cu ft / s) annually, due to tremendous volumes of water being lost in the Sudd wetlands . </P> <P> The Sobat River, which joins the Nile a short distance below Lake No, drains about half as much land, 225,000 km (86,900 sq mi), but contributes 412 cubic meters per second (14,500 cu ft / s) annually to the Nile . When in flood the Sobat carries a large amount of sediment, adding greatly to the White Nile's color . </P> <P> The Yellow Nile is a former tributary that connected the Ouaddaï Highlands of eastern Chad to the Nile River Valley c. 8000 to c. 1000 BC . Its remains are known as the Wadi Howar . The wadi passes through Gharb Darfur near the northern border with Chad and meets up with the Nile near the southern point of the Great Bend . </P>

Is the nile the only river that runs north