The principal rivers are the Limpopo and the Vaal; the former rises in the high watershed, south of Pretoria, at an altitude of 6300 feet above sea-level, flowing in a north-north-west direction through a very pretty and picturesque part in the Magalisberg range of mountains, which run east and west, on to where the Great Marico river falls into it, in 24 degrees 15 minutes South latitude, 27 degrees 7 minutes East longitude, at an altitude of 2690 feet, passing through a thickly wooded country with many native kraals, skirting Dwaasberg and other lofty hills that add much to the beauty of the landscape. From the junction of the Marico, the river turns in a northerly direction for about forty miles, where the Notuane river joins it; from this point the Limpopo turns with many bends and curves in a north-easterly and easterly direction for some 400 miles, forming the boundary between the Transvaal and the chief Khama, and the Matabele nation, down to 31 degrees 54 minutes East longitude, being the north-east corner of the Transvaal, and where the chief Umzelas territory joins up; from this point, after flowing east for some twenty miles, it takes a south-south-east direction, through Umzelas country to the Indian Ocean. It is a fine, broad stream, increasing in width from the junction of the Great Marico, where it is about 150 yards; at the Mokalapsie river, it is 200 yards; at the junction of the Shasha, 220 yards; and increases in size as it passes on through the low, flat country to the sea, where it is three miles wide. It can be made without any difficulty navigable up to the Rubie river distant from its mouth nearly 300 miles, taking into consideration the sinuosity of its course, whence a good road could be made to the interior; above this point there are many falls and rapids, the two most important are the Impopomene and the Tolo, above-named, both beautifully situated between thickly wooded banks; and over the granite rocks in its bed the water falls, and where some of the bed rocks are exposed, in the dry season may be seen hundreds of deep circular holes from one foot to six feet in depth, and from one to three feet in diameter, that have been worn by loose stones in the first instance being revolved round in a depression in the rock, and in time, by the rushing of the waters upon them, have increased them to the present size; they are similar in shape to those on the banks of the Vaal, Orange, and Zambese rivers. The immensity of time it must have taken to wear away such deep and large holes in a granite rock, makes one pause to think of the period when this river was first formed, because it is only a portion of the year, when the floods come down, that the water acts upon the stones in these holes. The principal tributaries of the Limpopo that rise in the Transvaal are the Apies at Pretoria, Sand, Pinaars, Plat, Matlabatse, Pongola, Palala, Nylstroom, Houdt, Limvubu, and the Olifants river with