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Considerable quantities of floating pistea weeds pass down the Victoria 
Nile from Lake Choga. They are well churned up between Fowera 
and the Murchison Falls, but finally enter Lake Albert. It would be 
easy to develop electricity to work a railway along these 68 kilometres. 
The principal tributaries of the Victoria Nile are the following : — 
On the right bank, the Gogonia, the marshy Kwania and Lenga, and 
theDuki. And on the left bank; the lake-like Sensiwa; the Kafu with 
its numerous feeders, large catchment basin but generally insignificant 
discharge ; and the Titi. The Uganda rivers are more like sponges 
than rivers, and in all probability the tail of the Victoria Nile has a 
discharge only slightly in excess of that at the head. 
1 1 . The Semliki River. — The Semliki river has its sources in Lake 
Edward just south of the Equator and flows into the southern end of Lake 
Albert, just as the Victoria Nile flows into the northern end. Lake 
Edward with the addition of Lake Dueru has an area of some 2500 
square kilometres and lies about 965 metres above sea level. Its waters 
as described by Sir William Garstin, are green in colour and brackish. 
The Semliki river discharges the surplus waters of the lake, and may 
be considered as having a discharge of 100 cubic metres per second as 
a minimum and 400 cubic metres per second as a maximum. In 
some 120 kilometres of its length this river traverses the eastern end 
of the Congo forest, and the day may not be far distant when this 
timber will be floated down the Semliki, towed across Lake Albert and 
sent down the Albert Nile to Gondokoro and Khartoum. The fall of 
the Semliki, according to accepted levels is 285 metres in 260 kilo- 
metres. The feeders of Lake Edward are the following:-— 
On the west, none. 
On the south, the Rutshuru and Ruendu. 
On the east, the Msalala, the Wampuna, the Chambura, and the 
Mpanga which has its sources on the slopes of Ruenzori. 
On the north, numerous glacier-fed torrents from the slopes of 
Ruenzori, the Nyamgasha and the Dibirra. The dry season 
discharges of all these rivers are small. The largest is under 10 
cubic metres per second. The flood discharges are considerable. 
12. Lake Albert Nyanza. — Lake Albert has an area of 4500 
square kilometres and lies about 680 metres above sea level. We have 
left the high lands of Uganda and are in the stifling heat of tropical 
Africa. There are considerable deposits of salt along the east shore of 
Lake Albert, as there are also around Lake Edward. According to 
