This river was almost a thousand miles longer until the Miocene era expansion of the Virunga volcanoes blocked its extreme upper course. This river has an Albert branch and passes through the Sudd swamp. One of its sources contains Rusumo Falls, and another is at Lake Tana. A southward bend in this river includes the fourth of a series of six rapids, its "cataracts." This river, whose Blue and White tributaries join at Khartoum, is overlooked by the city of Cairo along its banks. For 10 points, 
This river was almost a thousand miles longer until the Miocene era expansion of the Virunga volcanoes blocked its extreme upper course. This river has an Albert branch and passes through the Sudd swamp. One of its sources contains Rusumo Falls, and another is at Lake Tana. A southward bend in this river includes the fourth of a series of six rapids, its "cataracts." This river, whose Blue and White tributaries join at Khartoum, is overlooked by the city of Cairo along its banks. For 10 points, name this northeastern African river, the longest in the world.
This river was almost a thousand miles longer until the Miocene era expansion of the Virunga volcanoes blocked its extreme upper course.
{Nile} River