白ナイル川
The Blue Nile, which originates at Lake Tana in Ethiopia, provides on average some 58% of the Nile's Egyptian waters. This river has a steeper gradient and therefore flows more swiftly than the White Nile, which it joins at Khartoum. Unlike the White Nile, the Blue Nile carries a considerable amount of sediment. For several kilometers north of Khartoum, water closer to the eastern bank of the river, coming from the Blue Nile, is visibly muddy, while that closer to the western bank, and coming from the White Nile, is clearer.