Western Cape Colony, is represented by the Brak and Ongers rivers, and, farther west, by the Zak and Olifants rivers, which, united as the Hartebeest, reach the Orange about 25 m.
The low land between the high veld and the Waterberg and Zoutpansberg is traversed by the Olifants River, an east flowing tributary of the Limpopo.
The Vaal drains the greater part of the plateau, flowing westward towards the Atlantic. The waters of the northern escarpments of the plateau and of all the region farther north are carried to the Indian Ocean by the Limpopo (q.v.) and its tributaries the Olifants, Great Marico, Great Letaba, &c. Both the Vaal and the Limpopo in their main course have high steep banks.
The Dolomite Series, known to the Dutch as " Olifants Klip," consists of a bluish-grey magnesian limestone with bands of chert.
Woodbush districts north of the Olifants river.
Coal appears to have been first discovered in the neighbourhood of Bronkhorst Spruit between the Wilge and Olifants rivers, where it was so near the surface that farmers dug it up for their own use.
Above the sea, on one of the head streams of the Olifants River.