396 
GEOGRAPHICAL SYSTEMS. 
Probably the information of subsequent travellersv 
who had performed the circuit of the lake, shew- 
ed him the error of Edrisi in mistaking it for the 
sea. A still later geographer (Scheabeddin) says 
expressly that the branch of the Nile which flows 
through Djenawa (Gana) does not reach the sea.* 
Major Rennell has traced the following etymolo- 
gy : Ulil, Oulili, Oualet, Walet. If Walet, or any 
part of its territory, be Ulil, then the sea of 
Edrisi could scarcely be any thing else than the 
Dibbie. His measures, however, seem hardly to 
extend so far, but to agree better with another 
lake to the east of Tombuctoo ; the existence of 
which has been reported by recent travellers. 
Additional information, it is to be hoped, may 
soon be obtained, which will determine this curi- 
ous point. 
To the east of Gana, Wangara rests entirely 
upon the authority of the Arabians. Their des- 
cription of Cauga agrees very well with the no- 
tices of Horneman and Browne, so ably com- 
bined by Major Rennell.t But the space which 
fills up the interval between Cauga and the Nile, 
is involved in considerable obscurity ; nor does it 
appear to me that it has been very correctly 
understood by modern geographers. 
* Notices des Manuscrits du Roi, II. 156. 
f Illustrations of Horneman, ch. 3. 
