it is joined by the Bahr-el-Ghazal from the W., and bending to the E., now under the name White Nile, receives on that side the Sobat, and as a sluggish navigable stream flows past Fashoda on to Khartoum, where it is met by the Bahr-al-Azrak or Blue Nile; 200 m. lower it receives the Atbara or Black Nile.