Which tributary of the Nile, flowing out of Lake Tana in the Ethiopian Highlands, supplies the majority of the water and fertile silt reaching Egypt during the summer flood season?
Answer and explanation
Correct answer: D. Blue Nile (Abay)
- Step 1: The Blue Nile (Abay) flows out of Lake Tana in the Ethiopian Highlands and joins the White Nile at Khartoum, Sudan. Step 2. It supplies more than half of the Nile's annual flow and a much larger share, roughly 70 percent, during the July to October flood season, carrying the silt that built up the Delta. Answer: Blue Nile (Abay). Why not the others: The White Nile, from the Lake Victoria region, gives a steadier but smaller year-round flow, and little of the flood silt; The Atbara River is a seasonal Ethiopian tributary joining north of Khartoum that carries much less water than the Blue Nile; The Sobat River feeds the White Nile in South Sudan and adds far less flood water.
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