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Karoo

Semi-desert region in South Africa

  • 25 min read
  • 7 chapters
Landscape Anysberg Nature Reserve , Kannaland Local Municipality, Western Cape, South Africa
Winfried Bruenken ( Amrum ) · CC BY-SA 2.5

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Through Natural region and Galaxy

The Karoo formed an almost impenetrable barrier to the interior from Cape Town, and early adventurers, explorers, hunters, and travelers on the way to the Highveld unanimously denounced it as a frightening place of great heat, great frosts, great floods, and great droughts. Today, it is still a place of great heat and frosts, with an annual rainfall of between 50 and 250 mm (2.0–9.8 in). On some of the surrounding mountains it can be 250 to 500 mm (9.8–19.7 in) higher than on the plains. However, underground water is found throughout the Karoo, which is tapped by boreholes, making permanent settlements and sheep farming possible.

The xerophytic vegetation consists of aloes, mesembryanthemums, crassulas, euphorbias, stapelias, and desert ephemerals, spaced 50 cm (20 in) or more apart, becoming very sparse going northwards into Bushmanland and, from there, into the Kalahari Desert. The driest region of the Karoo, however, is its southwestern corner, between the Great Escarpment and the Cederberg-Skurweberg mountain ranges, called the Tankwa Karoo, which receives only 75 mm (3.0 in) of rain annually. The eastern and north-eastern Karoo are often covered by large patches of grassland. The typical Karoo vegetation previously supported large game, sometimes in vast herds.

Today, sheep thrive on the xerophytes, though each sheep requires about 4 hectares (9.9 acres) of grazing to sustain itself.

Divisions

The Karoo is divided into the Great Karoo and the Klein Karoo. The Klein Karoo is delimited in the south by the Outeniqua–Langeberg Mountains that run east–west parallel to the coast, and in the north by the Swartberg Mountain Range that also runs east–west. The Great Karoo lies to the north of the Swartberg.

Great Karoo

The only sharp and definite boundary of the Great Karoo is formed by the most inland ranges of Cape Fold Mountains to the south and south-west. The extent of the Karoo to the north is vague, fading gradually and almost imperceptibly into the increasingly arid Bushmanland towards the north-west. To the north and north-east, it fades into the savannah and grasslands of Griqualand West and the Highveld. The boundary to the east grades into the grasslands of the Eastern Midlands. The Great Karoo is itself divided by the Great Escarpment into the Upper Karoo (generally above 1,200–1,500 m (3,900–4,900 ft)) and the Lower Karoo on the plains below at 700–800 m (2,300–2,600 ft). A great many local names, each denoting different subregions of the Great Karoo, exist, some more widely, or more generally, known than others. In the Lower Karoo, going from west to east, they are the Tankwa Karoo, the Moordenaarskaroo, the Koup, the Vlakte, and the Camdeboo Plains. The Hantam, Kareeberge, Roggeveld, and Uweveld are the better known subregions of the Upper Karoo, though most of it is simply known as the Upper Karoo, especially in the north.

Klein Karoo

The Klein Karoo's boundaries are sharply defined by mountain ranges to the west, north, and south. The road between Uniondale and Willowmore is considered, by convention, to form the approximate arbitrary eastern extremity of the Klein Karoo. Its extent is much smaller than that of the Great Karoo. It is called the Klein Karoo, Afrikaans for Little Karoo.

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