DOWN THE CONGO TO THE ATLANTIC. 
445 
The relative rank of these four great tributaries may 
be estimated by their width, at or near the confluence. 
The Luama was 400 yards wide ; the Lira 300 yards, 
but deep ; the Urindi, 500 yards ; the Lowwa, 1 000 
yards. The parallel of latitude in which the Lowwa 
mouth is situated is fifty miles north of the extreme 
north end of Lake Tanganika. From all I could gather 
by a comparison of names and the relative authenticity 
of my informants, I am inclined to believe that the 
sources of this last great river may be placed near the 
south-west corner of Lake Muta-Nzige ; also, that the 
TO AVOID A CATARACT. 
Urindi’s head streams must approach the sources of the 
Luanda, which joins the Rusizi, and Hows into Lake 
Tanganika, and that the Lira must drain the country 
west of Uvira. 
The length of the Urindi river, which empties into 
the Livingstone only fifteen miles south of the Lowwa, 
may be estimated by a glance at the course of the 
Luama, which I followed from its source to its confluence 
with the Lualaba. In the same manner, the Lira’s 
course and length may be judged. 
The growing importance and volume of the tributaries 
as we proceed north also proves a northern prolongation 
