EcoNile — The Nile and Its Water | econile.org
A side-by-side comparison of the Nile's two major tributaries: where each begins, which countries it crosses, and how much water each contributes.
The Nile has two major tributaries, and they differ in more than name. The White Nile is longer and considered the headwaters of the river system; it begins near Lake Victoria and flows through Uganda and South Sudan before reaching Khartoum. The Blue Nile begins near Lake Tana in Ethiopia and, despite its shorter course, contributes over twice the water volume of the White Nile.
The White Nile's origin near Lake Victoria places it in the equatorial highlands of East Africa. From there it flows north through Uganda and South Sudan, regions where its flow is shaped by the geography of the Great Lakes and the Sudd wetlands of South Sudan. Its length makes it the nominal headwaters of the river.
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The Blue Nile's origin near Lake Tana in Ethiopia places it in the Ethiopian Highlands. Its course carries it northwest to Khartoum, and its contribution to the river's total water volume is more than double that of the White Nile. Volume, not length, is what the Blue Nile supplies to the combined river.
The two rivers meet at Khartoum, the capital of Sudan. This confluence is the point at which the White Nile's steady equatorial flow and the Blue Nile's larger seasonal volume combine into the single river that flows north to the Mediterranean Sea.
For anyone asking where the Nile gets its water, the answer is the combination of these two tributaries — one longer and considered the headwaters, the other contributing more than twice the water volume. The comparison table below sets the two side by side by source, countries crossed, and share of water volume.
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