Three hundred miles west of the Rubi is the Mongalla. It rises at the northern boundary of the State and, flowing south-south-west, reaches the Congo at Molieka. The Mongalla is a fine, open stream, and on its banks the Government has established a line of important stations. By these the State maintains control of the surrounding territory and renders possible commerce with a large population. Similar stations have been and are being erected along the smaller navigable streams, and these, when connected with the centres by railroad and by telegraph, as eventually they will be, will make the whole interior equally accessible. Probably no tributary of the Congo is of more importance than the Ubanghi. It was Van Gele who, in 1886, first explored the Ubanghi country and demonstrated the strategic value and commercial possibilities of this mighty river. The Uelle, which flows in a north-westerly direction, rises in the Blue Mountains. It was discovered by Dr. Junker, the German explorer, and may be considered the upper course of the Ubanghi. Above the Panga Falls, the Uelle is navigable for large vessels as far as Niangara. After receiving the waters of the Uelle the Ubanghi forms for a long distance the boundary between the Free State and the French territory. Beyond Banzyville the river makes a wide curve towards the north to Waddas, whence it flows almost directly south, joining the Congo a little above Lake Matumba. The rich valley through which this splendid stream, over a thousand miles in length, takes its winding course, comprises an area of 160,000 square miles. Emin Pasha described it as possessing wonderful productivity—“The Granary of Equatoria” he called it. Here the natives, who are instinctively agricultural, raise tobacco, coffee, and sugar-cane in large quantities. The highways now being constructed will give to the industry of this region an immediate impetus, and the natives, who are skilful in the making of brick, will greatly contribute to the development. It is also proposed to continue the Uelle Railway to the left bank of the Nile. Such a continuous route, amply justified by the resources of this section and by commercial considerations, will be a most desirable consummation. The Lua, an eastern branch of the Ubanghi, will prove of great commercial importance. Captain Heymans, who first navigated the Lua, explored it as far as Bowara. The Dekere, which also has been partly explored, is probably the upper course of the Lua, and this continuous stream will prove a convenient route to the Uelle. In this way the great detour of the Ubanghi, in which are the impassable cataracts of Zongo and Mokoangi, can be successfully avoided.