Salar de Uyuni
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Salar de Uyuni (or "Salar de Tunupa") is the world's largest salt flat, or playa, at over in area. It is in the Daniel Campos Province in
Potosí Potosí, known as Villa Imperial de Potosí in the colonial period, is the capital city and a municipality of the Department of Potosí in Bolivia. It is one of the highest cities in the world at a nominal . For centuries, it was the location o ...
in southwest
Bolivia , image_flag = Bandera de Bolivia (Estado).svg , flag_alt = Horizontal tricolor (red, yellow, and green from top to bottom) with the coat of arms of Bolivia in the center , flag_alt2 = 7 × 7 square p ...
, near the crest of the
Andes The Andes, Andes Mountains or Andean Mountains (; ) are the longest continental mountain range in the world, forming a continuous highland along the western edge of South America. The range is long, wide (widest between 18°S – 20°S ...
at an elevation of above sea level. The Salar was formed as a result of transformations between several prehistoric lakes that existed around forty thousand years ago but had all evaporated over time. It is now covered by a few meters of salt crust, which has an extraordinary flatness with the average elevation variations within one meter over the entire area of the Salar. The crust serves as a source of salt and covers a pool of
brine Brine is a high-concentration solution of salt (NaCl) in water (H2O). In diverse contexts, ''brine'' may refer to the salt solutions ranging from about 3.5% (a typical concentration of seawater, on the lower end of that of solutions used for br ...
, which is exceptionally rich in
lithium Lithium (from el, λίθος, lithos, lit=stone) is a chemical element with the symbol Li and atomic number 3. It is a soft, silvery-white alkali metal. Under standard conditions, it is the least dense metal and the least dense solid el ...
. The large area, clear skies, and exceptional flatness of the surface make the Salar ideal for calibrating the
altimeter An altimeter or an altitude meter is an instrument used to measure the altitude of an object above a fixed level. The measurement of altitude is called altimetry, which is related to the term bathymetry, the measurement of depth under water. The m ...
s of Earth observation satellites. Following rain, a thin layer of dead calm water transforms the flat into the world's largest mirror, across. The Salar serves as the major transport route across the Bolivian
Altiplano The Altiplano (Spanish for "high plain"), Collao (Quechua and Aymara: Qullaw, meaning "place of the Qulla") or Andean Plateau, in west-central South America, is the most extensive high plateau on Earth outside Tibet. The plateau is located at the ...
and is a prime breeding ground for several species of
flamingo Flamingos or flamingoes are a type of Wader, wading bird in the Family (biology), family Phoenicopteridae, which is the only extant family in the order Phoenicopteriformes. There are four flamingo species distributed throughout the Americas ...
s. Salar de Uyuni is also a climatological transitional zone since the towering tropical
cumulus congestus Cumulus congestus clouds, also known as towering cumulus, are a form of cumulus that can be based in the low or middle height ranges. They achieve considerable vertical development in areas of deep, moist convection. They are an intermediate stage ...
and
cumulonimbus incus A cumulonimbus incus (Latin ''incus'', " anvil"), also known as an anvil cloud, is a cumulonimbus cloud which has reached the level of stratospheric stability and has formed the characteristic flat, anvil-top shape. It signifies the thundersto ...
clouds that form in the eastern part of the salt flat during the summer cannot permeate beyond its drier western edges, near the Chilean border and the
Atacama Desert The Atacama Desert ( es, Desierto de Atacama) is a desert plateau in South America covering a 1,600 km (990 mi) strip of land on the Pacific coast, west of the Andes Mountains. The Atacama Desert is the driest nonpolar desert in the ...
. Salar has been used as a filming location for movies such as '' Star Wars: The Last Jedi'' (2017; as planet Crait), '' The Fall'' (2006), ''
Salt and Fire ''Salt and Fire'' is a 2016 thriller film written and directed by Werner Herzog. The film stars Michael Shannon, Veronica Ferres, and Gael García Bernal. It tells the story about a hostage-taking situation set against an ecological disaster in ...
'' (2016), ''The Unseen'' (2017), and several others.


Formation, geology, and climate

Salar de Uyuni is part of the
Altiplano The Altiplano (Spanish for "high plain"), Collao (Quechua and Aymara: Qullaw, meaning "place of the Qulla") or Andean Plateau, in west-central South America, is the most extensive high plateau on Earth outside Tibet. The plateau is located at the ...
of Bolivia in South America. The Altiplano is a high plateau, which was formed during uplift of the Andes mountains. The plateau includes fresh and saltwater lakes as well as salt flats and is surrounded by mountains with no drainage outlets.


History

The geological history of the Salar is associated with a sequential transformation between several vast lakes. Some 30,000 to 42,000 years ago, the area was part of a giant prehistoric lake, Lake Minchin. Its age was estimated by
radiocarbon dating Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon. The method was dev ...
shells from outcropping
sediment Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice or by the force of gravity acting on the particles. For example, sand an ...
s and carbonate reefs and varies between reported studies. Lake Minchin (named after Juan B. Minchin of Oruro) later transformed into Paleo Lake Tauca having a maximal depth of , and an estimated age of 13,000 to 18,000 or 14,900 to 26,100 years, depending on the source. The youngest prehistoric lake was Coipasa, which was radiocarbon dated to 11,500 to 13,400 years ago. When it dried, it left behind two modern lakes, Poopó and Uru Uru, and two major salt deserts,
Salar de Coipasa __NOTOC__ Lago Coipasa or Salar de Coipasa is a lake in Sabaya Province, Oruro Department, Bolivia. At an elevation of 3657 m, its surface area is 806 km². It is on the western part of Altiplano, 20 km north of Salar de Uyuni and south ...
and the larger Salar de Uyuni. Salar de Uyuni spreads over 10,582 km2, which is roughly 100 times the size of the
Bonneville Salt Flats The Bonneville Salt Flats are a densely packed salt pan in Tooele County in northwestern Utah. A remnant of the Pleistocene Lake Bonneville, it is the largest of many salt flats west of the Great Salt Lake. It is public land managed by the Bur ...
in the United States. Lake Poopó is a neighbor of the much larger
Lake Titicaca Lake Titicaca (; es, Lago Titicaca ; qu, Titiqaqa Qucha) is a large freshwater lake in the Andes mountains on the border of Bolivia and Peru. It is often called the highest navigable lake in the world. By volume of water and by surface area, ...
. During the wet season, Titicaca overflows and discharges into Poopó, which in turn, floods Salar De Coipasa and Salar de Uyuni. Lacustrine mud that is interbedded with salt and saturated with brine underlies the surface of Salar de Uyuni. The brine is a saturated solution of
sodium chloride Sodium chloride , commonly known as salt (although sea salt also contains other chemical salts), is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions. With molar masses of 22.99 and 35.45 g ...
,
lithium chloride Lithium chloride is a chemical compound with the formula Li Cl. The salt is a typical ionic compound (with certain covalent characteristics), although the small size of the Li+ ion gives rise to properties not seen for other alkali metal chlor ...
, and
magnesium chloride Magnesium chloride is the family of inorganic compounds with the formula , where x can range from 0 to 12. These salts are colorless or white solids that are highly soluble in water. These compounds and their solutions, both of which occur in natu ...
in water. It is covered with a solid salt crust varying in thickness between tens of centimeters and a few meters. The center of the Salar contains a few islands, which are the remains of the tops of ancient volcanoes submerged during the era of Lake Minchin. They include unusual and fragile coral-like structures and deposits that often consist of fossils and algae.


Climate

The area has a relatively stable average temperature with a peak at in November to January, and a low of in June. The nights are cold all through the year, with temperatures between . The relative humidity is rather low and constant throughout the year at 30% to 45%. The rainfall is also low at per month between April and November, but it may increase up to in January. However, except for January, even in the rainy season the number of rainy days is fewer than 5 per month.


Economic influence

Located in the Lithium Triangle, the Salar contains a large amount of
sodium Sodium is a chemical element with the symbol Na (from Latin ''natrium'') and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, being in group 1 of the periodic table. Its only stable iso ...
,
potassium Potassium is the chemical element with the symbol K (from Neo-Latin ''kalium'') and atomic number19. Potassium is a silvery-white metal that is soft enough to be cut with a knife with little force. Potassium metal reacts rapidly with atmosphe ...
,
lithium Lithium (from el, λίθος, lithos, lit=stone) is a chemical element with the symbol Li and atomic number 3. It is a soft, silvery-white alkali metal. Under standard conditions, it is the least dense metal and the least dense solid el ...
and
magnesium Magnesium is a chemical element with the symbol Mg and atomic number 12. It is a shiny gray metal having a low density, low melting point and high chemical reactivity. Like the other alkaline earth metals (group 2 of the periodic ta ...
(all in the chloride forms of
NaCl Sodium chloride , commonly known as salt (although sea salt also contains other chemical salts), is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions. With molar masses of 22.99 and 35.45 g ...
,
KCl Potassium chloride (KCl, or potassium salt) is a metal halide Salt (chemistry), salt composed of potassium and chlorine. It is odorless and has a white or colorless vitreous lustre, vitreous crystal appearance. The solid dissolves readily in wa ...
, LiCl and MgCl2, respectively), as well as
borax Borax is a salt (ionic compound), a hydrated borate of sodium, with chemical formula often written . It is a colorless crystalline solid, that dissolves in water to make a basic solution. It is commonly available in powder or granular form, ...
. With an estimated 9,000,000  t, Bolivia holds about 7% of the world's known lithium resources; most of those are in the Salar de Uyuni. Lithium is concentrated in the brine under the salt crust at a relatively high concentration of about 0.3%. It is also present in the top layers of the porous
halite Halite (), commonly known as rock salt, is a type of salt, the mineral (natural) form of sodium chloride ( Na Cl). Halite forms isometric crystals. The mineral is typically colorless or white, but may also be light blue, dark blue, purple, p ...
body lying under the brine; however, the liquid brine is easier to extract, by boring into the crust and pumping out the brine. The brine distribution has been monitored by the
Landsat The Landsat program is the longest-running enterprise for acquisition of satellite imagery of Earth. It is a joint NASA / USGS program. On 23 July 1972, the Earth Resources Technology Satellite was launched. This was eventually renamed to Lan ...
satellite and confirmed in ground drilling tests. Following those findings, an American-based international corporation has invested $137 million to developing lithium extraction. However, lithium extraction in the 1980s and 1990s by foreign companies met strong opposition from the local community. Locals believed that the money infused by mining would not reach them. The lithium in the salt flats contains more impurities, and the wet climate and high altitude make it harder to process. No mining plant is currently at the site, and the Bolivian government does not want to allow exploitation by foreign corporations. Instead, it intends to reach an annual production of 35,000 t by 2023 in a joint venture with ACI Systems Alemania GmbH. Salar de Uyuni is estimated to contain 10 billion tonnes (9.8 billion long tons; 11 billion short tons) of salt, of which less than 25,000 t is extracted annually. All miners working in the Salar belong to Colchani's cooperative. Because of its location, large area, and flatness, the Salar is a major car transport route across the Bolivian
Altiplano The Altiplano (Spanish for "high plain"), Collao (Quechua and Aymara: Qullaw, meaning "place of the Qulla") or Andean Plateau, in west-central South America, is the most extensive high plateau on Earth outside Tibet. The plateau is located at the ...
, except when seasonally covered with water.


Name

''Salar'' means salt flat in Spanish. ''Uyuni'' originates from the
Aymara language Aymara (; also ) is an Aymaran language spoken by the Aymara people of the Bolivian Andes. It is one of only a handful of Native American languages with over one million speakers.The other native American languages with more than one million sp ...
and means a
pen (enclosure) A pen is an enclosure for holding livestock. It may also perhaps be used as a term for an enclosure for other animals such as pets that are unwanted inside the house. The term describes types of enclosures that may confine one or many animal ...
; Uyuni is a surname and the name of a town that serves as a gateway for tourists visiting the Salar. Thus ''Salar de Uyuni'' can be loosely translated as a salt flat with enclosures, the latter possibly referring to the "islands" of the Salar; or as "salt-flat at Uyuni (the town named 'pen for animals')". Aymara legend tells that the mountains Tunupa, Kusku, and Kusina, which surround the Salar, were giant people. Tunupa married Kusku, but Kusku ran away from her with Kusina. Grieving Tunupa started to cry while breastfeeding her son. Her tears mixed with milk and formed the Salar. Many locals consider the Tunupa an important
deity A deity or god is a supernatural being who is considered divine or sacred. The ''Oxford Dictionary of English'' defines deity as a god or goddess, or anything revered as divine. C. Scott Littleton defines a deity as "a being with powers greate ...
and say that the place should be called Salar de Tunupa rather than Salar de Uyuni.


Flora and fauna

File:FishIslandSalarUyuni.jpg, A part of
Incahuasi Island Isla Incahuasi, Inkawasi or Inka Wasi (Spanish ''Isla'' island, Quechua ''Inka'', Inca ''wasi'' house,Teofilo Laime Ajacopa, Diccionario Bilingüe Iskay simipi yuyayk'ancha, La Paz, 2007 (Quechua-Spanish dictionary) "Inca house") is a hilly and rock ...
inside the Salar, featuring giant
cacti A cactus (, or less commonly, cactus) is a member of the plant family Cactaceae, a family comprising about 127 genera with some 1750 known species of the order Caryophyllales. The word ''cactus'' derives, through Latin, from the Ancient Greek ...
File:James Flamingo.jpg,
James's flamingo James's flamingo (''Phoenicoparrus jamesi''), also known as the puna flamingo, is a species of flamingo that lives at high altitudes in the Andean plateaus of Peru, Chile, Bolivia, and northwest Argentina. It is named for Harry Berkeley James, a ...
File:Culpeo MC.jpg,
Culpeo The culpeo (''Lycalopex culpaeus''), also known as culpeo zorro, Andean zorro, Andean fox, Paramo wolf, Andean wolf,Comparative ecology of two South American foxes, 'Dusicvon ariseus' and 'culpaeus' by Warren E. Johnson. Doctoral dissertation. Io ...
File:Bolivian vizcacha.jpg, Bolivian
vizcacha Viscacha or vizcacha (, ) are rodents of two genera (''Lagidium'' and ''Lagostomus'') in the family Chinchillidae. They are native to South America and convergently resemble rabbits. The five extant species of viscacha are: *The plains vis ...
File:Chloephaga melanoptera1.jpg,
Andean goose The Andean goose (''Chloephaga melanoptera'') is a species of waterfowl in tribe Tadornini of subfamily Anserinae.HBW and BirdLife International (2021) Handbook of the Birds of the World and BirdLife International digital checklist of the bird ...
File:Andean Hillstar (Oreotrochilus estella) perched.jpg,
Andean hillstar The Andean hillstar (''Oreotrochilus estella'') is a species of hummingbird in the "coquettes", tribe Lesbiini of subfamily Lesbiinae. It is found in Argentina, Bolivia, Chile, and Peru.HBW and BirdLife International (2020) ''Handbook of the Bi ...
File:Andean Flamingos Laguna Colorada Bolivia Luca Galuzzi 2006.jpg,
Andean flamingo The Andean flamingo (''Phoenicoparrus andinus'') is a species of flamingo native to the Andes mountains of South America. Until 2014, it was classified in genus ''Phoenicopterus''. It is closely related to James's flamingo, and the two make up th ...
s in the
Laguna Colorada __NOTOC__ Laguna Colorada (''Red Lagoon'') is a shallow salt lake in the southwest of the altiplano of Bolivia, within Eduardo Avaroa Andean Fauna National Reserve and close to the border with Chile. Contents The lake contains borax islands, ...
, south of the Salar File:VicunaSalarDeUyuni 20170503.jpg, Vicuñas near the Salar De Uyuni 2017
The Salar is virtually devoid of any wildlife or vegetation. The latter is dominated by giant cacti (''
Echinopsis ''Echinopsis'' is a large genus of cacti native to South America, sometimes known as hedgehog cactus, sea-urchin cactus or Easter lily cactus. One small species, ''E. chamaecereus'', is known as the peanut cactus. The 128 species range from l ...
atacamensis pasacana'', ''Echinopsis tarijensis'', etc.). They grow at a rate of about 1 cm/a to a height of about . Other shrubs include Pilaya, which is used by locals to cure
catarrh Catarrh is an exudate of inflamed mucous membranes in one of the airways or cavities of the body, usually with reference to the throat and paranasal sinuses. It can result in a thick exudate of mucus and white blood cells caused by the swelling o ...
, and Thola (''
Baccharis ''Baccharis'' is a genus of perennials and shrubs in the aster family (Asteraceae). They are commonly known as baccharises but sometimes referred to as "brooms", because many members have small thin leaves resembling the true brooms. They are ...
dracunculifolia''), which is burned as a fuel. Also present are
quinoa Quinoa (''Chenopodium quinoa''; , from Quechua ' or ') is a flowering plant in the amaranth family. It is a herbaceous annual plant grown as a crop primarily for its edible seeds; the seeds are rich in protein, dietary fiber, B vitamins, and ...
plants and queñua bushes. Every November, Salar de Uyuni is the breeding ground for three South American species of
flamingo Flamingos or flamingoes are a type of Wader, wading bird in the Family (biology), family Phoenicopteridae, which is the only extant family in the order Phoenicopteriformes. There are four flamingo species distributed throughout the Americas ...
feeding on local
brine shrimp ''Artemia'' is a genus of aquatic crustaceans also known as brine shrimp. It is the only genus in the family Artemiidae. The first historical record of the existence of ''Artemia'' dates back to the first half of the 10th century AD from Urmia L ...
s: the Chilean,
Andean The Andes, Andes Mountains or Andean Mountains (; ) are the List of mountain ranges#Mountain ranges by length, longest continental mountain range in the world, forming a continuous highland along the western edge of South America. The range i ...
, and rare
James's flamingo James's flamingo (''Phoenicoparrus jamesi''), also known as the puna flamingo, is a species of flamingo that lives at high altitudes in the Andean plateaus of Peru, Chile, Bolivia, and northwest Argentina. It is named for Harry Berkeley James, a ...
s. About 80 other bird species are present, including the
horned coot The horned coot (''Fulica cornuta'') is a species of bird found in the Andes of South America. It was described by Bonaparte in 1853 based on a specimen collected in Bolivia. For a long time it was known only from the type specimen. Description ...
,
Andean goose The Andean goose (''Chloephaga melanoptera'') is a species of waterfowl in tribe Tadornini of subfamily Anserinae.HBW and BirdLife International (2021) Handbook of the Birds of the World and BirdLife International digital checklist of the bird ...
, and
Andean hillstar The Andean hillstar (''Oreotrochilus estella'') is a species of hummingbird in the "coquettes", tribe Lesbiini of subfamily Lesbiinae. It is found in Argentina, Bolivia, Chile, and Peru.HBW and BirdLife International (2020) ''Handbook of the Bi ...
. The Andean fox, or
culpeo The culpeo (''Lycalopex culpaeus''), also known as culpeo zorro, Andean zorro, Andean fox, Paramo wolf, Andean wolf,Comparative ecology of two South American foxes, 'Dusicvon ariseus' and 'culpaeus' by Warren E. Johnson. Doctoral dissertation. Io ...
, is also present, and islands in the Salar (in particular
Incahuasi Island Isla Incahuasi, Inkawasi or Inka Wasi (Spanish ''Isla'' island, Quechua ''Inka'', Inca ''wasi'' house,Teofilo Laime Ajacopa, Diccionario Bilingüe Iskay simipi yuyayk'ancha, La Paz, 2007 (Quechua-Spanish dictionary) "Inca house") is a hilly and rock ...
) host colonies of rabbit-like
viscacha Viscacha or vizcacha (, ) are rodents of two genera ('' Lagidium'' and ''Lagostomus'') in the family Chinchillidae. They are native to South America and convergently resemble rabbits. The five extant species of viscacha are: *The plains visc ...
s.


Tourism


Hotels

Salar de Uyuni is a popular tourist destination, and consequently a number of hotels have been built in the area. Due to lack of conventional construction materials, many of them are almost entirely (walls, roof, furniture) built with salt blocks cut from the Salar. The first such hotel, named
Palacio de Sal Palacio de Sal (Spanish for "Palace of salt") is a hotel built of salt blocks. It is located at the edge of Salar de Uyuni, the world's largest Salt pan (geology), salt flat, south of the La Paz department's capital La Paz. Salar de Uyuni is ...
, was erected in 1993–1995 in the middle of the salt flat, and soon became a popular tourist destination. However, its location in the center of a desert caused sanitation problems, as most waste had to be collected manually. Mismanagement caused serious environmental pollution and the hotel had to be dismantled in 2002. Around 2007, a new hotel was built, under the name Palacio de Sal, in a new location at the eastern edge of Salar de Uyuni, 25 km away from the town of
Uyuni Uyuni (Aymara, ''uyu'' pen (enclosure), yard, cemetery, ''-ni'' a suffix to indicate ownership, "the one that has got a pen", "the one with a pen") is a city in the southwest of Bolivia. Uyuni primarily serves as a gateway for tourists visiting t ...
. The sanitary system has been restructured to comply with the government regulations. The hotel has a dry sauna and a steam room, a saltwater pool and whirlpool baths.


Train cemetery

One major tourist attraction is an antique train cemetery. It is outside Uyuni and is connected to it by the old train tracks. The town served in the past as a distribution hub for the trains carrying minerals en route to Pacific Ocean ports. The rail lines were built by British engineers arriving near the end of the 19th century and formed a sizeable community in Uyuni. The engineers were invited by the British-sponsored Antofagasta and Bolivia Railway Companies, now
Ferrocarril de Antofagasta a Bolivia The Ferrocarril de Antofagasta a Bolivia (British company name: Antofagasta (Chili) & Bolivia Railway or FCAB for short) is a private railway operating in the northern provinces of Chile. It is notable in that it was one of the earliest rail ...
. The rail construction started in 1888 and ended in 1892. It was encouraged by Bolivian President
Aniceto Arce Aniceto Arce Ruiz de Mendoza (15 April 1824, in Tarija – 14 August 1906) was a Bolivian lawyer and politician who served as the 22nd president of Bolivia from 1888 to 1892. He also served as the fourth vice president of Bolivia from 1880 to ...
, who believed Bolivia would flourish with a good transport system, but it was also constantly sabotaged by the local Aymara indigenous Indians who saw it as an intrusion into their lives. The trains were mostly used by the mining companies. In the 1940s, the mining industry collapsed, partly because of mineral depletion. Many trains were abandoned, producing the train cemetery. There are proposals to build a museum from the cemetery.


Accidents

Unfortunately accidents are not uncommon in the salt flats. Poorly maintained vehicles, untrained drivers, speeding, disregard for poor conditions, and the lack of regulation for tour companies continues to occur despite many fatal accidents.


Satellite calibration

Salt flats are ideal for calibrating the distance measurement equipment of satellites because they are large, stable surfaces with strong reflection, similar to that of ice sheets. As the largest salt flat on Earth, Salar de Uyuni is especially suitable for this purpose. In the low-rain period from April to November, due to the absence of industry and its high elevation, the skies above Salar de Uyuni are very clear, and the air is dry (relative humidity is about 30%; rainfall is roughly per month). It has a stable surface, smoothed by seasonal flooding — water dissolves the salt surface and thus keeps it leveled. As a result, the variation in the surface elevation over the area of Salar de Uyuni is less than normal to the Earth's circumference, and there are few square kilometers on Earth that are as flat. The surface reflectivity (
albedo Albedo (; ) is the measure of the diffuse reflection of sunlight, solar radiation out of the total solar radiation and measured on a scale from 0, corresponding to a black body that absorbs all incident radiation, to 1, corresponding to a body ...
) for ultraviolet light is relatively high at 0.69 and shows variations of only a few percent during the daytime. The combination of all these features makes Salar de Uyuni about five times better for satellite calibration than the surface of an ocean. Using Salar de Uyuni as the target, ICESat has already achieved the short-term elevation measurement accuracy of below . By using data from
MISR Misr or MISR may refer to: * Misr, the romanized Arabic name for Egypt * misr, singular of Arabic ''amsar'', which were early Arabic "garrison towns" * Misr (domain name), a top-level Internet domain name * Misr, a variant of the AKM assault rifle ...
to perform passive optical
bathymetry Bathymetry (; ) is the study of underwater depth of ocean floors (''seabed topography''), lake floors, or river floors. In other words, bathymetry is the underwater equivalent to hypsometry or topography. The first recorded evidence of water de ...
when the flat is flooded and calibrating the resultant water depth model with topographical data from the laser altimeter of
ICESat ICESat (Ice, Cloud, and land Elevation Satellite) was a NASA satellite mission for measuring ice sheet mass balance, cloud and aerosol heights, as well as land topography and vegetation characteristics. It operated as part of NASA's Earth Obs ...
, it has been shown that the Salar de Uyuni is not perfectly flat. The 2006 analysis revealed previously missed features: ridges between 20 and 30 centimetres in height that are roughly sinusoidal with a wavelength of 5 km (clearly visible in 1973 and 1975
LandSat The Landsat program is the longest-running enterprise for acquisition of satellite imagery of Earth. It is a joint NASA / USGS program. On 23 July 1972, the Earth Resources Technology Satellite was launched. This was eventually renamed to Lan ...
images, and still in the same places decades later), and a moat around the periphery that is 1–3 km wide and 20 to 50 cm deep. They originate from the variation in material density, and thus the gravitational force, beneath the Salar's sediments. Just as the ocean surface rises over denser seamounts, the salt flat surface also rises and falls to reflect the subsurface density variations.


Gallery

File:Salar de Uyuni 2013.jpg, Salar de Uyuni 2013 File:Piles of Salt Salar de Uyuni Bolivia Luca Galuzzi 2006 a.jpg, Piles of salt at the Salar File:Salar Uyuni au02.jpg, Llamas in the Salar File:Reflection on the Salar de Uyuni, bolivia.jpg, Reflection on the Salar de Uyuni File:Salar de Uyuni, Bolivia, 2016-02-04, DD 16-18 HDR.JPG, Reflections at sunset


See also

* Ouki * Puka Mayu *
Great Salt Lake The Great Salt Lake is the largest saltwater lake in the Western Hemisphere and the eighth-largest terminal lake in the world. It lies in the northern part of the U.S. state of Utah and has a substantial impact upon the local climate, particula ...
*
Rann of Kutch The Rann of Kutch (alternately spelled as Kuchchh) is a large area of salt marshes that span the border between India and Pakistan. It is located in Gujarat (primarily the Kutch district), India, and in Sindh, Pakistan. It is divided into t ...


References


External links

*
Salar de Uyuni official website
{{Authority control
Uyuni Uyuni (Aymara, ''uyu'' pen (enclosure), yard, cemetery, ''-ni'' a suffix to indicate ownership, "the one that has got a pen", "the one with a pen") is a city in the southwest of Bolivia. Uyuni primarily serves as a gateway for tourists visiting t ...
Landforms of Oruro Department Landforms of Potosí Department Endorheic lakes of South America Tourist attractions in Oruro Department Tourist attractions in Potosí Department Altiplano