Here, once, both streams met and became united in a lake, which might have formed a triangle, according to the direction of the White Downs, above Khartùm from the Blue River, near the village of Gos Burri, the smallest angle of which went towards the south into the White River. At that time, the Blue Stream exercised quite a different dominion, and did not condescend to the before-named bend at the Island of Tuti, from which bend the traveller is firmly convinced that the Blue Stream flows into the White. The inhabitants of the banks, however, assert the contrary, for the former, as being the Nile, is considered, as it were, sacred, from its superior water and its more beautiful colour; although they allow that both streams spring from one source. This likewise redounds to its fame, that it is said to flow five times quicker than the White Stream, which latter indeed is nearly stagnant in the dry season. With all its good qualities, the Blue Stream displays a destructive activity towards Khartùm. If it had extended this activity before, more towards its right shore on the east, and spared the low ground heaped up by it towards the west, to be the foundation of a future city, and formed by its alluvial deposit a dam against the White Stream, its waves would now wash up more against its west shore, exactly opposite to the principal side of Khartùm. It is very certain that it is not necessary to go back into the ages before history, to speak of a land-draining of the northern point of Sennaar, since the expression “fok el Bachr,” points plainly to the old river’s edge by the Mosque; and likewise, not a single brick has been found in all this lake soil of Khartùm, except on the hill near Burri, which also must be considered merely as a new shore of the lake. As I have said before, the Blue Stream always extends more towards the mouth of the White, which it has already pressed down against the edge of the rock, in the desert near Omdurman, whilst it extended itself, like a lake, immediately from Hubba in the extensive low country east of Halfaia, until it closed the road there with the hilly alluvial deposit upon which this city is partly built. If the lake ground at Khartùm was principally governed by the White Stream, and its deep, clayey site overlaid with sand, the blue stream has heightened its lake at Halfaia with a fruitful soil, which yet enjoys at high water its blessed waves, that impart, however, only a soft green to the forest.