Anglo Sudan g -Bgyptian ] THE NILE swamps east of the Bahr el- Jebel. These two rivers unite on the Sudan-Abyssinian frontier, whence the Sobat flows north -west through alluvial plains to its junction with the White Nile, fifty -six miles above Kodok (Fashoda). The river discharges about 900 cubic metres per second at flood time in October, sinking to 45 in mid -April, before the rise begins . The Nile, swollen by all these tributaries, has, at Berber, a maximum discharge in full flood of 14,000 to 16,000 cubic metres per second. Emerging from the northern end of Lake Albert, and flowing north , the Nile, here known as the Bahr el- Jebel ( river of the mountains ), enters the Sudan at Nimule . The reach between Lake Albert and the fron tier being navigable, the SudanGovernment has reserved a small enclave south of Nimule to act as a port of trans-shipment between Uganda and the Sudan . Four miles north of Nimule the river enters the Fola Rapids, and thence it continues with a turbulent course through rocks and rapids to Lado , where the Sudan plain is entered and the character of the river completely changes. From this point to Lake No (about 500 miles) it winds slowly among vast swamps, giving rise to alabyrinth of channels and lagoons, which change after every flood and make skilled pilotage essential. This is the so -called sudd area . Its full extent is unknown , since it has not been fully explored , but its area probably exceeds 35,000 The word sudd (“ block ”), popularly applied to the Nilotic swamps , really belongsto the great masses of vegetation which break from them during the stormy season, under the combined influence of gale and flood, and drift into the lagoons and ultimately the river channel. This sudd consists chiefly of papyrus and reeds, with the soil in which their roots are em bedded, and forms huge floating islands which ground when they reacha shallow and quickly root in the muddy bottom . Each fresh mass arriving is sucked underneath the first, until the whole becomes wedged .

square miles.