The altitude of Nyassa is 1200/x800 feet.

Tanganyika would thus go to Nyassa--down the Shire into the Zambesi and the sea, if a passage existed even below ground.
The large Lake, said to exist to the north-west of Tanganyika might, however, send a branch to the Nile; but the land rises up into a high ridge east of this Lake.
It is somewhat remarkable that the impression which intelligent Suaheli, who have gone into Karagwe, have received is, that the Kitangule flows from Tanganyika into Lake Ukerewe.

One of Syde bin Omar's people put it to me very forcibly the other day by saying, "Kitangule is an arm of Tanganyika!" He had not followed it out; but that Dagara, the father of Rumanyika, should have in his lifetime seriously proposed to deepen the upper part of it, so as to allow canoes to pass from his place to Ujiji, is very strong evidence of the river being large on the Tanganyika side.

We know it to be of good size, and requiring canoes on the Ukerewe side.

Burton came to the very silly conclusion that when a native said a river ran one way, he meant that it flowed in the opposite direction.