The Berg runs north and south, and from it run the chief streams which water the plain.

They are, beginning from the south, the Olifants, the Groot Letaba, the Letsitela, the Klein Letaba, and the Klein Labongo, on which stands Blaauwildebeestefontein.

But the greatest river of the plain, into which the others ultimately flow, is the Groot Labongo, which appears full-born from some subterranean source close to the place called Umvelos'.

North from Blaauwildebeestefontein the Berg runs for some twenty miles, and then makes a sharp turn eastward, becoming, according to my map, the Rooirand.
I pored over these details, and was particularly curious about the Great Labongo.

It seemed to me unlikely that a spring in the bush could produce so great a river, and I decided that its source must lie in the mountains to the north.