The Dwyka River is located in the

Karoo The Karoo ( ; from the Afrikaans borrowing of the South Khoekhoe !Orakobab or Khoemana word ''ǃ’Aukarob'' "Hardveld") is a semi-desert natural region of South Africa. No exact definition of what constitutes the Karoo is available, so its ext ...

region, in

South Africa South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. It is bounded to the south by of coastline that stretch along the South Atlantic and Indian Oceans; to the north by the neighbouring countri ...

. It flows from the North-west, joining the

Gamka River Gamka River ( af, Gamkarivier) is a river located in the Western Cape, South Africa. The name '' means 'Lion' and was probably named so by the San people (Bushmen). The river originates north of Beaufort West, generally flowing southwest towards ...

as a tributary at the

Gamka Dam Gamka is a South African place name and may refer to: Dams on the Gamka River * Leeu-Gamka Dam, on the Leeuw River near Beaufort West, Western Cape, South Africa * Gamkapoort Dam, on the Gamka River, near Prince Albert, Western Cape, South Africa ...

. In the 1870s, the

Cape Colony The Cape Colony ( nl, Kaapkolonie), also known as the Cape of Good Hope, was a British Empire, British colony in present-day South Africa named after the Cape of Good Hope, which existed from 1795 to 1802, and again from 1806 to 1910, when i ...

government expanded its railway network inland, towards the diamond fields of Kimberley. A station, also named Dwyka, was built where the line crossed the Dwyka river. The river's name was subsequently also adopted by geologists to define the

Karoo Ice Age The late Paleozoic icehouse, also known as the Late Paleozoic Ice Age (LPIA) and formerly known as the Karoo ice age, was an ice age that began in the Late Devonian and ended in the Late Permian, occurring from 360 to 255 million years ago (Mya) ...

some 300 million years ago. Key sites in South Africa show evidence of glaciation, including Nooitgedacht near Kimberley. In South Africa, near the

South Pole The South Pole, also known as the Geographic South Pole, Terrestrial South Pole or 90th Parallel South, is one of the two points where Earth's axis of rotation intersects its surface. It is the southernmost point on Earth and lies antipod ...

at that time as a result of

plate tectonics Plate tectonics (from the la, label=Late Latin, tectonicus, from the grc, τεκτονικός, lit=pertaining to building) is the generally accepted scientific theory that considers the Earth's lithosphere to comprise a number of large ...

, large ice sheets or

glaciers A glacier (; ) is a persistent body of dense ice that is constantly moving under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries. It acquires distinguishing features, such as ...

covered high-lying areas. Geologists term this upland the Cargonian Highlands, stretching from what is now the

Northern Cape The Northern Cape is the largest and most sparsely populated province of South Africa. It was created in 1994 when the Cape Province was split up. Its capital is Kimberley. It includes the Kalahari Gemsbok National Park, part of the Kgalagadi T ...

through

Gauteng Gauteng ( ) is one of the nine provinces of South Africa. The name in Sotho-Tswana languages means 'place of gold'. Situated on the Highveld, Gauteng is the smallest province by land area in South Africa. Although Gauteng accounts for only ...

Mpumalanga Mpumalanga () is a province of South Africa. The name means "East", or literally "The Place Where the Sun Rises" in the Swazi, Xhosa, Ndebele and Zulu languages. Mpumalanga lies in eastern South Africa, bordering Eswatini and Mozambique. It ...

.McCarthy, T. & Rubidge, B. 2005. ''The story of earth and life: a Southern African perspective on a 4.6-billion-year journey''. Kumba Resources. p 195-197.

References

Karoo {{SouthAfrica-river-stub

See also

References