Editing Kalahari Desert

{{Short description|Semi-arid sandy savanna in Southern Africa}}
{{Redirect-synonym|Kalahari|[[Kalahari Resorts]]}}
{{Use dmy dates|date=November 2020}}
{{Infobox valley
| name               = Kalahari Desert
| other_name         = 
| photo              = Kalahari.png
| photo_caption      = A satellite image of the Kalahari by [[NASA WorldWind]]
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| map_image          = Kalahari Desert and Kalahari Basin map.svg
| map_caption        = Kalahari Desert (maroon)<br />[[Kalahari Basin]] (orange)
| location           = 
| country            = [[Botswana]]
| country1           = [[Namibia]]
| country2           = [[South Africa]]
| region             = [[Southern Africa|Southern Region]]

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| length_km          = 4000
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| area               = 
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| area_km2           = 900,000
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| river              = [[Orange River]]
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The '''Kalahari Desert''' is a large [[semiarid climate|semiarid]] sandy [[savanna]] in [[Southern Africa]] covering {{convert|900000|km2|abbr=on}} including much of [[Botswana]] as well as parts of [[Namibia]] and [[South Africa]].

It is not to be confused with the Angolan, Namibian, and South African [[Namib]] coastal desert, whose name is of [[Khoekhoe language|Khoekhoegowab]] origin and means "vast place".

==Etymology==
''Kalahari'' is derived from the [[Tswana language|Tswana]] word ''Kgala'', meaning "the great thirst", or ''Kgalagadi'', meaning "a waterless place";<ref name=SAltena>{{cite web |url=http://www.southerncape.co.za/geography/regions/kalahari.php |title=The Kalahari-Basin |date = 15 July 2010 |archive-url = https://web.archive.org/web/20150725154710/http://www.southerncape.co.za/geography/regions/kalahari.php |archive-date = 25 July 2015 }}</ref> the Kalahari has vast areas covered by red sand without any permanent surface water.

== History ==
{{Expand section|date=April 2021}}
The Kalahari Desert was not always a dry desert. The [[fossil]] flora and fauna from [[Gcwihaba]] Cave in Botswana indicates that the region was much wetter and cooler at least from 30 to 11 thousand [[Before Present]], especially after 17,500 BP.<ref>{{cite journal|last1=Robbins|first1=L. H.|last2=Murphy|first2=M. L.|display-authors=et al. |year=1996|title=Paleoenvironment and Archaeology of Drotsky's Cave: Western Kalahari Desert, Botswana|journal=Journal of Archaeological Science|volume=23 |issue=1 |pages=7–22 |doi=10.1006/jasc.1996.0002}}</ref>

== Geography ==
{{More citations needed section|date=February 2019}}
{{Multiple image |perrow = 1 |image1 = Kalahari E02 00.jpg |caption1 = Kalahari in Namibia |image2 = KalahariBirdView.jpg |caption2 = Bird's eye view of the Kalahari in Namibia: the dark dots are [[Vachellia erioloba|camel thorns]] |image3 = Kalahari Lehmpfanne.jpg |caption3 = Kalahari [[Dry lake|claypan]] near [[Onderombapa]]}}
Drainage of the desert is by dry black valleys, seasonally inundated pans, and the large [[salt pan (geology)|salt pan]]s of the [[Makgadikgadi Pan]] in Botswana and [[Etosha Pan]] in Namibia. The only permanent river, the [[Okavango River|Okavango]], flows into a [[river delta|delta]] in the northwest, forming marshes that are rich in wildlife. Ancient dry riverbeds—called [[omuramba]]—traverse the central northern reaches of the Kalahari and provide standing pools of water during the rainy season.

A semi-desert, with huge tracts of excellent grazing after good rains, the Kalahari supports more animals and plants than a true desert, such as the [[Namib Desert]] to the west. There is little rainfall, and the summer temperature is very high. The driest areas usually receive {{cvt|110|-|200|mm}} of rain per year,<ref name="SAltena" /> and the wettest just a little over {{cvt|500|mm}}. The surrounding [[Kalahari Basin]] covers over {{cvt|2500000|km2}} extending farther into Botswana, Namibia, and South Africa, encroaching into parts of [[Angola]], [[Zambia]] and [[Zimbabwe]].

==Climate==
The climate is sub-humid rather than semi-arid in the north and east, where the dry forests, savannahs, and salt lakes prevail. South and west, where the vegetation is predominantly [[Deserts and xeric shrublands|xeric]] savanna or even a semi-desert, the climate is "Kalaharian" [[semi-arid]]. The Kalaharian climate is subtropical (average annual temperature greater than or equal to 18&nbsp;°C, at peaks reaching 40&nbsp;°C and above, with mean monthly temperature of the coldest month strictly below 18&nbsp;°C), and is semi-arid with the dry season from April to September, the coldest six months of the year. It is the southern tropical equivalent of the [[Sahel]]ian climate with the wet season during summer. The altitude has been adduced as the explanation why the Kalaharian climate is not tropical; its altitude ranges from 600 to 1600 meters (and generally from 800 to 1200 meters), resulting in a cooler climate than that of the Sahel or [[Sahara]]. For example, winter frost is common from June to August, rarely seen in the warmer Sahelian regions.<ref>{{in lang|fr}} ''Les milieux désertiques'', Jean Demangeot, Edmond Bernus, 2001. Editor: Armand Colin. {{ISBN|9782200251970}}, page 20 in particular.</ref> For the same reason, summer temperatures certainly can be very hot, but not in comparison to regions of low altitude in the Sahel or Sahara, where some stations record average temperatures of the warmest month around 38&nbsp;°C, whereas the average temperature of the warmest month in any region in the Kalahari never exceeds 29&nbsp;°C, though daily temperatures occasionally reach up to close to {{convert|45|°C|°F|0|abbr=on}} (44.8&nbsp;°C at Twee Rivieren Rest Camp in 2012).<ref>{{cite web|url=http://www.mherrera.org/records.htm|title=World Record Temperatures -Highest Lowest Hottest Coldest temperatures-|website=www.mherrera.org}}</ref>

[[File:Gewitter in der Kalahari.jpg|thumb|Heavy [[thunderstorm]] near [[Stampriet]]]]
The dry season lasts eight months or more, and the wet season typically from less than one month to four months, depending on location. The southwestern Kalahari is the driest area, particularly a small region toward the west-southwest of Tsaraxaibis (Southeast of Namibia). The average annual rainfall ranges from around 110&nbsp;mm (close to aridity) to more than 500&nbsp;mm in some north and east areas. During summertime in all regions, rainfall may go with heavy thunderstorms. In the driest and sunniest parts of the Kalahari, over 4,000 hours of sunshine are recorded annually on average.

In the Kalahari, there are three main mechanisms of atmospheric circulation, dominated by the [[Kalahari High]] [[anticyclone]]<ref>{{in lang|fr}} Tropicalité Jean Demangeot Géographie physique intertropicale, pages 44–45, Figure 19, source: Leroux 1989.</ref> in winter, and by the Kalahari Heat Low in summer:<ref> P. D. Tyson FRSSAf & S. J. Crimp (1998) THE CLIMATE OF THE KALAHARI TRANSECT, Transactions of the Royal Society of South Africa, 53:2, 93–112, DOI: 10.1080/00359199809520380 </ref>

* The North and Northwest of the Kalahari are subject to the alternation "[[Intertropical Convergence Zone]] (ITCZ)/"Continental [[Trade winds]]". The ITCZ is the meeting area of the boreal trade winds with their austral counterparts what meteorologists call "Meteorological equator" and the sailors "Doldrum" or "Pot-au-noir" : the ITCZ generates rains in the wet season, whereas the continental trade winds cause the dry season;
* The rest of the Kalahari is subject to the maritime trade winds that largely shed their moisture as they cross up and over the [[Great Escarpment, Southern Africa|Southern African Great Escarpment]] before arriving over the Kalahari.
*In the southern hemisphere summer (from December to February), a low-pressure system develops over the Kalahari, which is driven by strong surface heating (known as a [[Thermal low|Thermal Low]]). The low-pressure system helps to control the moisture-bearing easterly wind emanating from the Indian Ocean,<ref> P. D. Tyson FRSSAf & S. J. Crimp (1998) THE CLIMATE OF THE KALAHARI TRANSECT, Transactions of the Royal Society of South Africa, 53:2, 93–112, DOI: 10.1080/00359199809520380 </ref> thus influencing rainfall across southern Africa.<ref>{{Cite book| url=https://oxfordre.com/climatescience/display/10.1093/acrefore/9780190228620.001.0001/acrefore-9780190228620-e-513 | doi=10.1093/acrefore/9780190228620.013.513 | chapter=Climate of Southern Africa | title=Oxford Research Encyclopedia of Climate Science | year=2017 | last1=Reason | first1=C.J.C. | isbn=978-0-19-022862-0 }}</ref>

There are huge [[Subterranean river|subterranean]] water reserves beneath parts of the Kalahari; the [[Dragon's Breath Cave]], for example, is the largest documented non-subglacial underground lake. Such reserves may partly be the residues of ancient lakes; the Kalahari Desert was once a much wetter place. The ancient [[Lake Makgadikgadi]] dominated the area, covering the Makgadikgadi Pan and surrounding areas, but it drained or dried out some 10,000 years ago. It may have once covered as much as {{convert|120000|km2}}.<ref>{{cite book|last1=Goudie|first1=Andrew|title=Great Warm Deserts of the World: Landscapes and Evolution|date=2002|publisher=Oxford University Press|page=204}}</ref> In ancient times, there was sufficient moisture for farming, with dikes and dams collecting the water. These are now filled with sediment, breached, or no longer in use, though they can be readily seen via Google Earth.<ref>{{Cite web|url=http://www.sciforums.com/threads/ancient-dikes-dams-and-reservoirs-of-the-kalahari-region.159050/|title=Ancient Dikes, Dams and Reservoirs of the Kalahari Region|website=www.sciforums.com}}</ref>

The Kalahari has had a complex climatic history over the past million or so years, in line with major global changes. Changes in the last 250,000 years have been reconstructed from various data sources, providing evidence of former extensive lakes and drier periods. During the latter, the area of the Kalahari has expanded to include parts of western Zimbabwe, Zambia, and Angola.<ref>Thomas, D.S.G. and Shaw, P.A. 1991 'The Kalahari Environment'. Cambridge University Press, Cambridge</ref>

==Vegetation and flora==
[[File:Devil's thorn flower (Tribulus zeyheri), Kalahari.jpg|thumb|Devil's thorn flower ([[Tribulus]] zeyheri) growing in the Kalahari Desert]]
[[File:Sand dune in the Kalahari Desert (Namibia).jpg|thumb|[[Vachellia erioloba|Camel thorn]] scattered on [[dune]]s in the Kalahari Desert]]
Due to its low aridity, the Kalahari supports a variety of flora. The native flora includes [[acacia]] trees and many other herbs and grasses.<ref>[http://kalahari.kastlwerk.de/ Martin Leipold, ''Plants of the Kalahari'']</ref> The [[kiwano]] fruit, also known as the horned melon, melano, African horned cucumber, jelly melon, or hedged gourd, is [[Endemism|endemic]] to a region in the Kalahari Desert (specific region unknown).<ref>{{Cite web|url=https://www.wikihow.com/Eat-a-Kiwano-(Horned-Melon)|title=How to Eat a Kiwano (Horned Melon)|website=wikiHow}}</ref>

Even where the Kalahari "desert" is dry enough to qualify as a [[Desert#Definition|desert]] in the sense of having low [[Precipitation (meteorology)|precipitation]], it is not strictly speaking a desert because it has too dense a ground cover. The main region that lacks ground cover is in the southwest Kalahari (southeast of Namibia, northwest of South Africa, and southwest of Botswana) in the south of the [[Kgalagadi Transfrontier Park]]. For instance, in the [[ZF Mgcawu District Municipality]] of South Africa, total vegetation cover may be as low as 30.72% on non-protected (from cattle grazing) farmlands south of Twee Rivieren Rest Camp and 37.74% in the protected (from cattle grazing) South African side of the Kgalagadi Transfrontier Park:<ref>{{cite journal |first1=Bernd |last1=Wasiolka |first2=Niels |last2=Blaum |title=Comparing biodiversity between protected savanna and adjacent non-protected farmland in the southern Kalahari |pages=836–841 [Table 2 on p. 838] |journal=[[Journal of Arid Environments]] |volume=75 |issue=9 |year=2011 |doi=10.1016/j.jaridenv.2011.04.011 |bibcode=2011JArEn..75..836W }}</ref> these southernmost Kalahari xeric savanna areas are truly semi-deserts. However, in all the remaining Kalahari, except on salt pans during the dry season, the vegetation cover can be denser, up to almost 100%, in some limited areas.

In an area of about 600,000&nbsp;km<sup>2</sup> in the south and west of the Kalahari, the vegetation is mainly [[Deserts and xeric shrublands|xeric]] [[savanna]]. This area is the [[ecoregion]] identified by [[World Wide Fund for Nature]] as Kalahari xeric savanna AT1309. Typical savanna grasses include ''[[Schmidtia]]'', ''[[Stipagrostis]]'', ''[[Aristida]]'', and ''[[Eragrostis]]''; these are interspersed with trees such as camelthorn (''[[Acacia erioloba]]''), grey camelthorn (''[[Acacia haematoxylon]]''), shepherd's tree (''[[Boscia albitrunca]]''), blackthorn (''[[Acacia mellifera]]''), and silver cluster-leaf (''[[Terminalia sericea]]'').

In certain areas where the climate is drier, it becomes a true [[semi-desert]] with ground not entirely covered by vegetation: "open" as opposed to "closed" vegetation. Examples include the north of the [[ZF Mgcawu District Municipality]], itself in the north of South Africa, and the [[Keetmanshoop Rural]] in the southeast of Namibia. In the north and east, dry forests cover an area of over 300,000&nbsp;km<sup>2</sup> in which [[Baikiaea plurijuga|Rhodesian teak]] and several species of [[acacia]] are prominent. These regions are termed [[Kalahari Acacia-Baikiaea woodlands]] AT0709.<ref name = "WWFAT">{{cite web|url=http://worldwildlife.org/biomes/deserts-and-xeric-shrublands|title=Deserts and xeric shrublands - Biomes - WWF|website=World Wildlife Fund|access-date=25 April 2013|archive-date=15 March 2018|archive-url=https://web.archive.org/web/20180315012232/https://www.worldwildlife.org/biomes/deserts-and-xeric-shrublands|url-status=dead}}</ref>

Outside the Kalahari "desert", but in the Kalahari basin, halophytic vegetation to the north is adapted to pans, lakes that are completely dry during the dry season, and maybe for years during droughts, such as in Etosha ([[Etosha Pan halophytics]] AT0902) and Makgadikgadi ([[Zambezian halophytics]] AT0908).<ref name = "WWFAT"/>

A totally different vegetation is adapted to the [[Perennial water|perennial fresh water]] of the [[Okavango Delta]], an ecoregion termed [[Zambezian flooded grasslands]] AT0907.<ref name = "WWFAT"/>

==Fauna==
[[File:Suricata.jpg|thumb|A [[meerkat]] in the Kalahari]]
The Kalahari is home to the [[lion]] (''Panthera leo''), [[cheetah]] (''Acinonyx jubatus''), [[African leopard]] (''Panthera pardus''), [[spotted hyena]] (''Crocuta crocuta''), [[brown hyena]] (''Parahyaena brunnea''), and [[African wild dog]] (''Lycaon pictus pictus''). [[Birds of prey]] include the [[secretarybird]] (''Sagittarius serpentarius''), [[martial eagle]] (''Polemaetus bellicosus'') and other eagles, the [[Verreaux's eagle-owl|giant eagle owl]] (''Bubo lacteus'') and other owls, [[falcon]]s, [[goshawk]]s, [[kestrel]]s, and [[kite (bird)|kite]]s. Other animals include [[wildebeest]], [[springbok]], [[gemsbok]] and other [[antelope]]s, [[Cape porcupine]]s (''Hystrix africaeaustralis''), and [[ostrich]]es (''Struthio camelus'').<ref>{{cite web|url=http://worldwildlife.org/ecoregions/at1309|title=Kalahari xeric savanna - Ecoregions - WWF|website=World Wildlife Fund}}</ref>

Some of the areas within the Kalahari are seasonal [[wetland]]s, such as the [[Makgadikgadi Pans]] of [[Botswana]]. This area, for example, supports numerous [[halophilic]] species, and in the rainy season, tens of thousands of [[flamingo]]s visit these pans.<ref>Hogan, C. Michael (2008). [http://www.megalithic.co.uk/article.php?sid=22373&mode=&order=0 ''Makgadikgadi'', Megalithic Portal, ed. A. Burnham].</ref>

==Protected areas==
The following protected areas were established in the Kalahari:
*[[Central Kalahari Game Reserve]]
*[[Kgalagadi Transfrontier Park]]
*[[Khutse Game Reserve]]
*Tswalu Kalahari

==Population==
[[File:San-Mann beim Sammeln der Teufelskralle (Namibia).jpg|thumb|upright|San man collecting [[Harpagophytum|devil's claw]] (2017)]]
The [[San people]] have lived in the Kalahari for 20,000 years as [[hunter-gatherer]]s.<ref>{{Cite web |last=Marshall |first=L. |date=2003 |title=Bushmen driven from ancestral lands in Botswana |work=National Geographic News |place=Johannesburg |url=http://news.nationalgeographic.com/news/2003/04/0416_030416_san2_2.html |archive-url=https://web.archive.org/web/20051024221016/http://news.nationalgeographic.com/news/2003/04/0416_030416_san2_2.html |url-status=dead |archive-date=24 October 2005 |access-date=2009-04-22}}</ref> They hunt wild game with bows and poisoned arrows and gather edible plants, such as berries, melons and nuts, as well as insects. The San get most of their water requirements from plant roots and desert melons found on or under the desert floor. They often store water in the blown-out shells of ostrich eggs. The San live in huts built from local materials—the frame is made of branches, and the roof is thatched with long grass. Most of their hunting and gathering techniques replicate pre-historic tribes. [[Bantu languages|Bantu]]-speaking [[Tswana people|Tswana]], [[Kgalagadi language|Kgalagadi]], and [[Herero people|Herero]] and a small number of European settlers also live in the Kalahari desert. The city of [[Windhoek]] is situated in the [[Kalahari Basin]].{{cn|date=October 2024}}

==Kalahari, San and diamonds==
{{See also|Ancestral land conflict in Botswana}}

In 1996, [[De Beers]] evaluated the potential of diamond mining at Gope. In 1997, the eviction of the San and [[Bakgalagadi]] tribes in the [[Central Kalahari Game Reserve]] from their land began.<ref name=heartofdryness2009>
{{cite book
|title=Heart of Dryness
|first=James
|last=Workman
|pages=323
|publisher=Walker Publishing
|year=2009
}}</ref>
In 2006, a Botswana High Court ruled in favor of the San and Bakgalagadi tribes in the reserve, finding their eviction unlawful. The Government of Botswana granted a permit to De Beers' Gem Diamonds/Gope Exploration Company (Pty) Ltd. to conduct mining activities within the reserve.<ref name=survival>
{{cite web
|url=http://www.survivalinternational.org/news/5600
|title=UN report condemns Botswana's treatment of Bushmen
|date=3 March 2010
|access-date=31 March 2013
|publisher=Survival for Tribal Peoples
}}</ref>

==Settlements within the Kalahari==
{{col-begin}}
{{col-break}}
'''Botswana'''
* [[Gaborone]]
* [[Ghanzi]]
* [[Orapa]]
* [[Tshabong]]
* [[Tshane]]
{{col-break}}
'''Namibia'''
* [[Gobabis]]
* [[Mariental, Namibia|Mariental]]
{{col-break}}
'''South Africa'''
* [[Upington]]
* [[Noenieput]]
* [[Rietfontein]]
{{col-end}}

==See also==
*[[Karoo]]
*[[Kgalagadi (disambiguation)]]
*[[Thar desert]]
*[[Sahara]]
*[[Hot deserts]]
*[[Climate change in Namibia]]

==References==
{{Reflist}}

==Further reading==
* {{cite book|last=Main|first=Michael|title=Kalahari : life's variety in dune and delta|year=1987|isbn=1868120015}}

==External links==
* {{Commonscatinline}}
* [http://www.owens-foundation.org/docs/kalahari2.htm "Cry of the Kalahari"]{{Dead link|date=March 2025 |bot=InternetArchiveBot |fix-attempted=yes }}
* [http://www.scidev.net/en/sub-suharan-africa/news/sub-saharan-africa-news-in-brief-25-march-9-april.html Kalahari desert's forgotten influence on carbon levels]

{{Deserts}}
{{Regions of Africa}}
{{Biodiversity of South Africa|ecoreg}}
{{Authority control}}

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[[Category:Kalahari Desert| ]]
[[Category:Botswana–Namibia relations]]
[[Category:Deserts of Botswana]]
[[Category:Deserts of Namibia]]
[[Category:Deserts of South Africa]]
[[Category:Ergs of Africa]]