Course of the Blue Nile from Ethiopia to Sudan15.6N 32.5E
The golden yellow terrain of Sudan darkens to brown before crossing the border into Ethiopia, where it takens on a green tint in some areas.
Lake Tana, in Ethiopia’s highlands, appearing greenish in color here, provides the source of the Blue Nile River. The river flows northwest, joining with the White Nile at the city of Khartoum, in Sudan.
Just below the rivers’ confluence is the Gezira Scheme, a huge irrigation project that distributes water from the Blue Nile via a series of canals and ditches to farms lying between the banks of the two rivers. This agricultural area appears slightly greenish here.