The principal tributaries on the west and north are the Eland, Great Marico, Notuane, Makalapsie, Setuane, Serube, Pakwe, Maclutsie, Shasha, Makhae, Kubie, and the Nuanettie, and their several branches, which drain the country on the eastern side of the two watersheds. The Great Marico, with its branches of Little Marico and Molmane, drains a considerable extent of country in the Marico and Molmane district, and a large portion of Bechuanaland under the chiefs Gaseitsive, Sechele, Makose, and Lindsey. The remainder pass through the chief Khama's country, and the Mashona country under the Matabele king, Lo-Bengulu. The eastern branches all rise in the Transvaal as under:--the Apies passes by Pretoria, Pienaar, Matlabas Sand, Palala, Magalaquen, Hout, Lovolo, and the Olifants river with its many branches. Their fountains rise on the north side of the watershed, which passes east. The other rivers are the Manica, with its three principal branches, the Sabie, Crocodile, and Umcomati, that partly drain the Lydenburg gold-fields; the Umbolosi and the Maputa, with two main branches, the Uzutu and Pongola, that fall into Delagoa Bay. The eastern coast-line, north of the Limpopo, drains the territory under the chief Umzela; the two principals are the Sabie or Sabia, which rises in the northern watershed at Sakaloto kraal, 18 degrees 10 minutes South latitude, 32 degrees 8 minutes East longitude, at an altitude of 4210 feet above sea-level, and the Buzi river, which supplies Umzela's kraal, and both rivers enter the Indian Ocean in Sofala Bay. These rivers complete the Limpopo basin, which drains the northern portion of the Transvaal, the Portuguese settlement, in addition to those already named. THE ORANGE AND VAAL RIVER SYSTEM, AND THE ANCIENT RIVER SYSTEM OF THE KALAHARA DESERT, COVERING AN AREA OF 520,000 SQUARE MILES. The only portion of the Orange river which forms the south boundary of South Central Africa is that part from its mouth to the junction of the Vaal. The Orange above that junction turns south-east, and from Ramah, which is the point where the boundary between Griqualand West and the Orange Free State join, the river is the northern boundary of the Cape Colony up to Basutoland, where the head-fountains rise in the mountain regions of that territory, and it is the boundary of Natal near Giant's Castle, at an altitude of 10,000 feet above sea-level.