Much of the interior of Southern Africa consists of a high plateau, the higher portions 1,500–2,100 m (4,900–6,900 ft) of which are known as the highveld, starting at the Drakensberg escarpment, 220 km (140 miles) to the east of Johannesburg and sloping gradually downwards to the west and southwest, as well as to the north, through the bushveld towards the Limpopo River.
[7] These higher, cooler areas (generally more than 1,500 m or 4,900 ft above sea level) are characterised by flat or gently undulating terrain, vast grasslands, and a modified tropical or subtropical climate.
This southern limb of the lowveld is bounded by South Africa's border with Mozambique to the east and the northeastern part of Drakensberg to the west.
[14] Some of the characteristic species[15] in the thornveld include: Sandveld, in the general sense of the word, is a type of veld characterised by dry, sandy soil, typical of certain areas of the Southern African region.
[17] The sandveld vegetation has a particular pattern of growth, rarely covering the whole terrain, thus leaving patches of sandy soil exposed on the surface.
Some of the typical sandveld species are Acacia haematoxylon, A. luederitzii, Boscia albitrunca, Terminalia sericea, Lonchocarpus nelsii, Bauhinia petersiana, and Baphia massaiensis.
Areas of hardveld also occur in South Africa in the mountainous central Kamiesberg of the Northern Cape with hilly escarpments and deep river valleys.
The flora of the hardveld is typical of rocky savanna, with denser vegetation, so fewer denuded patches than in the sandveld, as well as taller trees.
Peltophorum africanum, Acacia nigrescens, A. tortilis, Combretum apiculatum, and Colophospermum mopane are some of the representative species of the northern hardveld.