The English name Nile and the Arabic names en-Nîl and an-Nîl both derive from the Latin Above Khartoum, the Nile is also known as the White Nile, a term also used in a limited sense to describe the section between Lake No and Khartoum. The White Nile starts in equatorial East Africa, and the Blue Nile begins in Ethiopia.Both branches are on the western flanks of the East African Rift.Formerly Lake Tanganyika drained northwards along the African Rift Valley into the White Nile, making the Nile about 1,400 kilometers (870 mi) longer, until it was blocked in Miocene times by the bulk of the Virunga Volcanoes.
When the Nile floods it leaves a rich silty deposit which fertilizes the soil.
The Nile no longer floods in Egypt since the completion of the Aswan Dam in 1970.
After Mongalla, the Bahr Al Jabal enters the enormous swamps of the Sudd region of South Sudan.
More than half of the Nile's water is lost in this swamp to evaporation and transpiration.
The White Nile is considered to be the headwaters and primary stream of the Nile itself.
The Blue Nile, however, is the source of most of the water and silt.
The drainage basin of the Nile covers 3,254,555 square kilometers (1,256,591 sq mi), about 10% of the area of Africa.
The Nile basin is complex, and because of this, the discharge at any given point along the mainstem depends on many factors including weather, diversions, evaporation and evapotranspiration, and groundwater flow.
The Blue Nile (Amharic: and flows into Sudan from the southeast.
The two rivers meet just north of the Sudanese capital of Khartoum.
In Coptic, the words piaro (Sahidic) or phiaro (Bohairic) meaning "the river" (lit.