Andrew A. Anderson, Twenty-Five Years in a Waggon in South Africa…
“ 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 its many tributaries, all flowing into the Limpopo on its right bank. ”
