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85-629: The delta consists of the middle course of the Niger River , between the bifurcated Niger and its tributary the Bani , which from here run north towards the desert. The Niger is the longest river in West Africa. Towns such as the river-port of Mopti , Sévaré and Djenné , with its mud-brick Great Mosque lie in the 400 km-long region. The Fulani and Dogon inhabit the Macina region and

170-692: A cichlid , Gobiocichla wonderi . The construction of a large irrigation project upstream of the Inner Niger Delta threatens its ecology and the livelihoods of its inhabitants. The 100,000 ha project is an extension to the area irrigated by the Office du Niger through the Malibya canal. The extension, which was under construction in 2010, is financed by the Libya Africa Investment Portfolio which will also have

255-463: A "frame" at the original level around the edge of the relief, or place a head in a hemispherical recess in the block (see Roman example in gallery). Though essentially very similar to Egyptian sunk relief, but with a background space at the lower level around the figure, the term would not normally be used of such works. It is also used for carving letters (typically om mani padme hum ) in the mani stones of Tibetan Buddhism . Sunk relief technique

340-676: A drill rather than chisels , enabling and encouraging compositions extremely crowded with figures, like the Ludovisi Battle sarcophagus (250–260 CE). These are also seen in the enormous strips of reliefs that wound around Roman triumphal columns . The sarcophagi in particular exerted a huge influence on later Western sculpture. The European Middle Ages tended to use high relief for all purposes in stone, though like Ancient Roman sculpture , their reliefs were typically not as high as in Ancient Greece. Very high relief re-emerged in

425-647: A few larger caskets like the Casket with Scenes of Romances (Walters 71264) in Baltimore , Maryland , in the United States. Originally they were very often painted in bright colours. Reliefs can be impressed by stamps onto clay, or the clay pressed into a mould bearing the design, as was usual with the mass-produced terra sigillata of Ancient Roman pottery . Decorative reliefs in plaster or stucco may be much larger; this form of architectural decoration

510-556: A flow near the mouth of the river standing at 177.0 km /year before the 1980s and 147.3 km /year during the 1980s. The Niger takes one of the most unusual routes of any major river, a boomerang shape that baffled geographers for two centuries. Its source ( Tembakounda ) is 240 km (150 mi) inland from the Atlantic Ocean, but the river runs directly away from the sea into the Sahara Desert , then takes

595-547: A gem seal, perhaps as sculptors trained in the Greek tradition attempted to use traditional Egyptian conventions. Small-scale reliefs have been carved in various materials, notably ivory , wood, and wax. Reliefs are often found in decorative arts such as ceramics and metalwork ; these are less often described as "reliefs" than as "in relief". Small bronze reliefs are often in the form of "plaques" or plaquettes , which may be set in furniture or framed, or just kept as they are,

680-517: A key origin and destination for trans-Saharan trade , fueling the wealth of great empires such as the Ghana , Mali, and Songhai Empires . Major trading ports along the river, including Timbuktu and Gao, became centers of learning and culture. Trade to the Niger bend region also brought Islam to the region in approximately the 14th century CE. Much of the northern Niger basin remains Muslim today, although

765-640: A large proportion of the survivals of portable secular art from Late Antiquity . In the Gothic period the carving of ivory reliefs became a considerable luxury industry in Paris and other centres. As well as small diptychs and triptychs with densely packed religious scenes, usually from the New Testament , secular objects, usually in a lower relief, were also produced. These were often round mirror-cases, combs, handles, and other small items, but included

850-521: A maze of streams and swamps that did not look like the head of a great river. He died in 1806 on a second expedition attempting to prove the Niger-Congo connection. The theory became the leading one in Europe. Several failed expeditions followed; however the mystery of the Niger would not be solved for another 25 years, in 1830, when Richard Lander and his brother became the first Europeans to follow

935-492: A popular form for European collectors, especially in the Renaissance. Various modelling techniques are used, such repoussé ("pushed-back") in metalwork, where a thin metal plate is shaped from behind using various metal or wood punches, producing a relief image. Casting has also been widely used in bronze and other metals. Casting and repoussé are often used in concert in to speed up production and add greater detail to

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1020-527: A revival in the 20th century, being popular on buildings in Art Deco and related styles, which borrowed from the ancient low reliefs now available in museums. Some sculptors, including Eric Gill , have adopted the "squashed" depth of low relief in works that are actually free-standing. Mid-relief, "half-relief" or mezzo-rilievo is somewhat imprecisely defined, and the term is not often used in English,

1105-516: A sharp right turn near the ancient city of Timbuktu and heads southeast to the Gulf of Guinea . This strange geography apparently came about because the Niger River is two ancient rivers joined together. The upper Niger, from the source west of Timbuktu to the bend in the current river near Timbuktu , once emptied into a now dry lake to the east northeast of Timbuktu, while the lower Niger started to

1190-453: A single figure; accordingly some writers prefer to avoid all distinctions. The opposite of relief sculpture is counter-relief , intaglio , or cavo-rilievo , where the form is cut into the field or background rather than rising from it; this is very rare in monumental sculpture . Hyphens may or may not be used in all these terms, though they are rarely seen in "sunk relief" and are usual in " bas-relief " and "counter-relief". Works in

1275-642: A tenth as much sediment as the Nile because the Niger's headwaters lie in ancient rocks that provide little silt . Like the Nile, the Niger floods yearly; this begins in September, peaks in November, and finishes by May. An unusual feature of the river is the Inner Niger Delta , which forms where its gradient suddenly decreases. The result is a region of braided streams , marshes , and large lakes;

1360-525: Is found in many styles of interiors in the post-Renaissance West, and in Islamic architecture . Many modern and contemporary artists such as Paul Gauguin , Ernst Barlach , Ernst Ludwig Kirchner , Pablo Picasso , Eric Gill , Jacob Epstein , Henry Moore , Claudia Cobizev , up to Ewald Matare have created reliefs. In particular low reliefs were often used in the 20th century on the outsides of buildings, where they are relatively easy to incorporate into

1445-477: Is from the Latin verb relevare , to raise (lit. to lift back). To create a sculpture in relief is to give the impression that the sculpted material has been raised above the background plane . When a relief is carved into a flat surface of stone (relief sculpture) or wood ( relief carving ), the field is actually lowered, leaving the unsculpted areas seeming higher. The approach requires a lot of chiselling away of

1530-475: Is not to be confused with "counter-relief" or intaglio as seen on engraved gem seals – where an image is fully modeled in a "negative" manner. The image goes into the surface, so that when impressed on wax it gives an impression in normal relief. However many engraved gems were carved in cameo or normal relief. A few very late Hellenistic monumental carvings in Egypt use full "negative" modelling as though on

1615-487: Is often used for the background areas of compositions with the main elements in low-relief, but its use over a whole (usually rather small) piece was effectively invented and perfected by the Italian Renaissance sculptor Donatello . In later Western art, until a 20th-century revival, low relief was used mostly for smaller works or combined with higher relief to convey a sense of distance, or to give depth to

1700-544: Is the main river of West Africa , extending about 4,180 kilometres (2,600 miles). Its drainage basin is 2,117,700 km (817,600 sq mi) in area. Its source is in the Guinea Highlands in south-eastern Guinea near the Sierra Leone border. It runs in a crescent shape through Mali , Niger , on the border with Benin and then through Nigeria , discharging through a massive delta , known as

1785-530: Is then joined by various tributaries but also loses more water to evaporation. The quantity of water entering Nigeria was estimated at 25 km /year before the 1980s and at 13.5 km /year during the 1980s. The most important tributary is the Benue River which merges with the Niger at Lokoja in Nigeria. The total volume of tributaries in Nigeria is six times higher than the inflow into Nigeria, with

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1870-424: Is therefore cheaper to produce, as less of the background needs to be removed in a carving, or less modelling is required. In the art of Ancient Egypt , Assyrian palace reliefs , and other ancient Near Eastern and Asian cultures, a consistent very low relief was commonly used for the whole composition. These images would usually be painted after carving, which helped define the forms; today the paint has worn off in

1955-520: The Alhambra ), Rome, and Europe from at least the Renaissance, as well as probably elsewhere. However, it needs very good conditions to survive long in unmaintained buildings – Roman decorative plasterwork is mainly known from Pompeii and other sites buried by ash from Mount Vesuvius . Low relief was relatively rare in Western medieval art , but may be found, for example in wooden figures or scenes on

2040-498: The Kainji Dam , Shiroro Dam , Zungeru Dam , and Jebba Dam are used to generate hydropower. The water resources of the Niger River are under pressure because of increased water abstraction for irrigation. The construction of dams for hydropower generation is underway or envisaged in order to alleviate chronic power shortages in the countries of the Niger basin. The FAO estimates the irrigation potential of all countries in

2125-480: The Khmer Empire . High relief (or altorilievo , from Italian ) is where in general more than half the mass of the sculpted figure projects from the background. Indeed, the most prominent elements of the composition, especially heads and limbs, are often completely undercut, detaching them from the field. The parts of the subject that are seen are normally depicted at their full depth, unlike low relief where

2210-888: The Niger Delta , into the Gulf of Guinea in the Atlantic Ocean . The Niger is the third-longest river in Africa, exceeded by the Nile and the Congo River . Its main tributary is the Benue River . The Niger has different names in the different languages of the region: The earliest use of the name "Niger" for the river is by Leo Africanus in his Della descrittione dell’Africa et delle cose notabili che ivi sono , published in Italian in 1550. Nevertheless, "Nigris"

2295-605: The "upper", "lower" and "middle" Niger river basin during the Scramble for Africa at the end of the 19th century. As part of the West Africa Sahel region, Niger River has a hot climate characterized by very high temperatures year-round; a long, intense dry season from October–May; and a brief, irregular rainy season linked to the West African monsoon. The Niger River is a relatively clear river, carrying only

2380-1044: The 1,460 panels of the 9th-century Borobudur temple in Central Java , Indonesia , narrating the Jataka tales or lives of the Buddha . Other examples are low reliefs narrating the Ramayana Hindu epic in Prambanan temple, also in Java, in Cambodia , the temples of Angkor , with scenes including the Samudra manthan or "Churning the Ocean of Milk" at the 12th-century Angkor Wat , and reliefs of apsaras . At Bayon temple in Angkor Thom there are scenes of daily life in

2465-547: The 16th century it was used for large figures (many also using high relief) at the Chateau of Fontainebleau , which were imitated more crudely elsewhere, for example in the Elizabethan Hardwick Hall . Shallow-relief, in Italian rilievo stiacciato or rilievo schicciato ("squashed relief"), is a very shallow relief, which merges into engraving in places, and can be hard to read in photographs. It

2550-601: The Borgou of the Inner Niger Delta. According to a report in Jeune Afrique , the researcher tried to alert the authorities about the need to find alternative livelihoods for the pastoralists, apparently without success. Three Ramsar sites , a total of 1,620 km have been declared in the delta; Lac Horo , Lac Debo , and the Séri floodplain. But the delta is largely unprotected and at the same time fishing and farming in

2635-470: The Macina turns into a network of lakes and channels. Cattle , pearl millet , and rice are its important agricultural products. The Macina inland delta also provides water and fish for the Malians living there and during the wet season is a haven for large numbers of birds. Due to its proximity to the widening Sahel , there have been concerns that the Macina may be getting less rain every year. In

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2720-511: The Niger River region, including yams , African rice ( Oryza glaberrima ), and pearl millet . The Sahara aridification may have triggered, or at least accelerated, these domestications. Agriculture, as well as fishing and animal husbandry, led to the rise of settlements like Djenné-Djenno in the Inner Delta, now a World Heritage Site . The region of the Niger bend, in the Sahel , was

2805-460: The Niger river basin at 2.8 million hectares. Only 0.93m hectares (ha) were under irrigation in the late 1980s. The irrigation potential was estimated at 1.68m ha in Nigeria 0.56m ha in Mali, and the actual irrigated area was 0.67m ha and 0.19m ha. Relief Relief is a sculptural method in which the sculpted pieces remain attached to a solid background of the same material. The term relief

2890-601: The Nile, a notion which persisted in the Arab and European worlds – and further added the Senegal River as the "Ger" – until the 19th century. While the true course of the Niger was presumably known to locals, it was a mystery to the outside world until the late 18th century. The connection to the Nile River was made not simply because this was then known as the great river of " Aethiopia " (by which all lands south of

2975-525: The Renaissance, and was especially used in wall-mounted funerary art and later on Neoclassical pediments and public monuments. In the Buddhist and Hindu art of India and Southeast Asia, high relief can also be found, although it is not as common as low to mid-reliefs. Famous examples of Indian high reliefs can be found at the Khajuraho temples, with voluptuous, twisting figures that often illustrate

3060-507: The amount of flooding it receives. Precipitation in the water basins of the upper course of the Bani and Niger rivers makes for rising waterlevels downstream. The rising water floods varying parts of the low-level delta area, with the water rise determined by the amount of rain fallen upstream. This in turn, is influenced by the northward movement of the Intertropical Convergence Zone . A delay exists between

3145-420: The background, which takes a long time. On the other hand, a relief saves forming the rear of a subject, and is less fragile and more securely fixed than a sculpture in the round, especially one of a standing figure where the ankles are a potential weak point, particularly in stone. In other materials such as metal, clay, plaster stucco , ceramics or papier-mâché the form can be simply added to or raised up from

3230-579: The background. From the Parthenon Frieze onwards, many single figures in large monumental sculpture have heads in high relief, but their lower legs are in low relief. The slightly projecting figures created in this way work well in reliefs that are seen from below, and reflect that the heads of figures are usually of more interest to both artist and viewer than the legs or feet. As unfinished examples from various periods show, raised reliefs, whether high or low, were normally "blocked out" by marking

3315-599: The background. Monumental bronze reliefs are made by casting . There are different degrees of relief depending on the degree of projection of the sculpted form from the field, for which the Italian and French terms are still sometimes used in English. The full range includes high relief (Italian alto-rilievo , French haut-relief ), where more than 50% of the depth is shown and there may be undercut areas, mid-relief (Italian mezzo-rilievo ), low relief (Italian basso-rilievo , French: bas-relief ), and shallow-relief (Italian rilievo schiacciato ), where

3400-521: The basin rainfall in the basin (mm) Hydrometric stations on the Niger River kilometer (rkm) (m) (km ) start Average, minimum and maximum discharge of the Niger River at Koulikoro (Upper Niger), Niamey (Middle Niger) and Lokoja (Lower Niger). Period from 2000/06/01 to 2024/05/31. Average discharge of the Niger River at Niger Delta (period from 2010 to 2018): Niger River at Lokoja average, minimum and maximum discharge (1946 to 2023): The main tributaries from

3485-521: The centre of the Sahelian kingdoms of Mali and Gao . The surrounding Niger River Basin is one of the distinct physiographic sections of the Sudan province, which in turn is part of the larger African massive physiographic division. The Niger River basin, located in western Africa , covers 7.5% of the continent and spreads over ten countries. Niger River basin: areas and rainfall by country within

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3570-442: The changing degrees of waterlevel rises. This division in roughly three zones (flooded, periodically flooded and not-periodically flooded), makes for patches that vary in their nature according to their proximity to a main body water and elevation. In turn, this strongly affects land use in and around the inland delta, as human impact is driven by agriculture , both irrigated and rainfed, grazing and browsing of herds and flocks and

3655-416: The collection of wood for fuel, all dependent on the availability of water. The Inland Delta forms a green oasis in its semi-arid surroundings. Its vegetation growth is limited by the availability of water, thus giving patches more often or longer subject to flooding a denser and more tree-like vegetation cover. As said, flooding cycles follow the precipitation cycle. The vegetation cycle in its turn follows

3740-447: The composition, especially for scenes with many figures and a landscape or architectural background, in the same way that lighter colours are used for the same purpose in painting. Thus figures in the foreground are sculpted in high-relief, those in the background in low-relief. Low relief may use any medium or technique of sculpture, stone carving and metal casting being most common. Large architectural compositions all in low relief saw

3825-553: The course of the Niger to the ocean. In 1946, three Frenchmen, Jean Sauvy, Pierre Ponty and movie maker Jean Rouch , former civil servants in the African French colonies , set out to travel the entire length of the river, as no one else seemed to have done previously. They travelled from the beginning of the river near Kissidougou in Guinea, walking at first till a raft could be used, then changing to various local crafts as

3910-413: The delta is vital to the livelihoods of the people of Mali. Low water levels in the rivers, lack of rain, increasing human population and a break-up of the traditional tribal arrangements for sharing the resources of the delta are all factors that may contribute to severely damaging the ecosystem. In particular fishing is less regulated (in the past only two tribes were permitted to fish) and fish stocks in

3995-546: The desert were called by Classical writers), but because the Nile like the Niger flooded every summer. Through the descriptions of Leo Africanus and even Ibn Battuta – despite his visit to the river – the myth connecting the Niger to the Nile persisted. Many European expeditions to plot the river were unsuccessful. In 1788 the African Association was formed in England to promote the exploration of Africa in

4080-468: The early 19th century, Seku Amadu founded a Massina Empire in the region, building a capital at Hamdullahi in 1820. The Massina fell to El Hadj Umar Tall 's Toucouleur Empire in 1862, who in turn fell to the French army. The region became a part of the country of Mali on its independence in 1960. The Niger inland Delta lies in the Sahelian zone, and has an ecosystem that is largely dependent on

4165-411: The elements seen are "squashed" flatter. High relief thus uses essentially the same style and techniques as free-standing sculpture, and in the case of a single figure gives largely the same view as a person standing directly in front of a free-standing statue would have. All cultures and periods in which large sculptures were created used this technique in monumental sculpture and architecture. Most of

4250-522: The endangered West African subspecies of black crowned crane ( Balearica pavonina pavonina ). Most large mammals have been removed from the area by the human population. Mammals remaining include the African manatee , known as the sea cow which lives in the rivers and feeds on underwater plants. And the rivers are rich in fish including two endemics; the Mochokidae catfish Synodontis gobroni and

4335-522: The erotic Kamasutra positions. In the 9th-century Prambanan temple, Central Java , high reliefs of Lokapala devatas , the guardians of deities of the directions, are found. The largest high relief sculpture in the world is the Stone Mountain Confederate Memorial in the U.S. state of Georgia , which was cut 42 feet deep into the mountain, and measures 90 feet in height, 190 feet in width, and lies 400 feet above

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4420-524: The final relief. In stone, as well as engraved gems, larger hardstone carvings in semi-precious stones have been highly prestigious since ancient times in many Eurasian cultures. Reliefs in wax were produced at least from the Renaissance . Carved ivory reliefs have been used since ancient times, and because the material, though expensive, cannot usually be reused, they have a relatively high survival rate, and for example consular diptychs represent

4505-488: The flood season. Only low lying patches near a persistent water body are vegetated year-round. The area is not uniform: according to relief , proximity to a water body and soil type, different species exist. Roughly, three regions with characteristic species can be discerned: Southern Delta The low-lying floodplains can sustain aquatic plants and grasses including the grasses Acroceras amplectens and Echinochloa pyramidalis , burgu millet ( Echinochloa stagnina ) and

4590-565: The flooding cycle with a certain delay: it takes days for grasses to germinate after flooding, but months before trees die of a lack of water when floodwater has once again receded. When classifying vegetation in a grass, shrub and tree layer, up to 80% of vegetation cover in the Sahel consists of grass. In the delta area however, water is more readily available and a larger proportion of cover consists of bushes and trees. Vegetation cover itself changes as well, reaching 100% during and shortly after

4675-539: The front the small variations in depth register as a three-dimensional image. Other versions distort depth much less. The term comes from the Italian basso rilievo via the French bas-relief ( French pronunciation: [baʁəljɛf] ), both meaning "low relief". The former is now a very old-fashioned term in English, and the latter term is becoming so. Low relief is a technique which requires less work, and

4760-538: The great majority of surviving examples, but minute, invisible remains of paint can usually be discovered through chemical means. The Ishtar Gate of Babylon , now in Berlin, has low reliefs of large animals formed from moulded bricks, glazed in colour. Plaster, which made the technique far easier, was widely used in Egypt and the Near East from antiquity into Islamic times (latterly for architectural decoration, as at

4845-467: The ground. Sunk or sunken relief is largely restricted to the art of Ancient Egypt where it is very common, becoming after the Amarna period of Ahkenaten the dominant type used, as opposed to low relief. It had been used earlier, but mainly for large reliefs on external walls, and for hieroglyphs and cartouches . The image is made by cutting the relief sculpture itself into a flat surface to enhance

4930-623: The hopes of locating the Niger, and in June 1796 the Scottish explorer Mungo Park was the first European to lay eyes on the middle portion of the river since antiquity (and perhaps ever). He wrote an account in 1799, Travels in the Interior of Africa . Park proposed a theory that the Niger and Congo were the same river. Although the Niger Delta would seem like an obvious candidate, it was

5015-472: The impression of three-dimensionality. In a simpler form, the images are usually mostly linear in nature, like hieroglyphs, but in most cases the figure itself is in low relief, but set within a sunken area shaped round the image, so that the relief never rises beyond the original flat surface. In some cases the figures and other elements are in a very low relief that does not rise to the original surface, but others are modeled more fully, with some areas rising to

5100-483: The insides of the folding wings of multi-panel altarpieces . The revival of low relief, which was seen as a classical style, begins early in the Renaissance; the Tempio Malatestiano in Rimini , a pioneering classicist building, designed by Leon Battista Alberti around 1450, uses low reliefs by Agostino di Duccio inside and on the external walls. Since the Renaissance plaster has been very widely used for indoor ornamental work such as cornices and ceilings, but in

5185-461: The lovegrass Eragrostis atrovirens . Outer fringes - The grasslands on the edges of the watercourses, are heavily grazed. Plants include the beardgrass Andropogon gayanus , dūrvā grass Cynodon dactylon , and the thatching grass Hyparrhenia dissoluta . Along the many watercourses, Mimosa asperata and Salix chevalieri grow above a Cyperus maculatus understory. Northern Delta Characterized by emergent sand ridges which sustain

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5270-448: The lower reaches in modern Nigeria , as these were not recognized at the time as being the same river. When European colonial powers began to send ships along the west coast of Africa in the 16th and 17th centuries, the Senegal River was often postulated to be the seaward end of the Niger. The Niger Delta, pouring into the Atlantic through mangrove swamps and thousands of distributaries along more than 160 kilometres (100 mi),

5355-709: The many grand figure reliefs in Ancient Greek sculpture used a very "high" version of high relief, with elements often fully free of the background, and parts of figures crossing over each other to indicate depth. The metopes of the Parthenon have largely lost their fully rounded elements, except for heads, showing the advantages of relief in terms of durability. High relief has remained the dominant form for reliefs with figures in Western sculpture, also being common in Indian temple sculpture. Smaller Greek sculptures such as private tombs, and smaller decorative areas such as friezes on large buildings, more often used low relief. Hellenistic and Roman sarcophagus reliefs were cut with

5440-441: The mouth: tributary tributary (km) (km ) (m /s) At the end of the African humid period around 5,500 years before present, the modern Sahara Desert, once a savanna , underwent desertification . As plant species sharply declined, humans migrated to the fertile Niger River bend region, with abundant resources including plants for grazing and fish. Like in the Fertile Crescent , many food crops were domesticated in

5525-492: The open air (if inside caves, whether natural or human-made, they are more likely to be called "rock-cut"). This type is found in many cultures, in particular those of the Ancient Near East and Buddhist countries. A stele is a single standing stone; many of these carry reliefs. The distinction between high and low relief is somewhat subjective, and the two are very often combined in a single work. In particular, most later "high reliefs" contain sections in low relief, usually in

5610-453: The original surface. This method minimizes the work removing the background, while allowing normal relief modelling. The technique is most successful with strong sunlight to emphasise the outlines and forms by shadow, as no attempt was made to soften the edge of the sunk area, leaving a face at a right-angle to the surface all around it. Some reliefs, especially funerary monuments with heads or busts from ancient Rome and later Western art, leave

5695-428: The outline of the figure and reducing the background areas to the new background level, work no doubt performed by apprentices (see gallery). A low relief is a projecting image with a shallow overall depth, for example used on coins, on which all images are in low relief. In the lowest reliefs the relative depth of the elements shown is completely distorted, and if seen from the side the image makes no sense, but from

5780-404: The palm trees Hyphaene thebaica and Borassus aethiopum , the gum arabic tree Acacia nilotica , Guarea senegalensis , Mimosa asperata and Ziziphus mauritiana . The delta is home to birds in large numbers including hundreds of thousands of wintering garganeys , pintails and ruffs and breeding colonies of cormorant , heron , spoonbill , ibis and other waterbirds including

5865-470: The peak amount of precipitation and the maximum water level in the inland delta area. While the wet season lasts three months from July till September, the western and southern edges of the delta area are not flooded until early to mid-October. The consequence is that parts of the delta are flooded while the dry season is well under way. Note that only the lowest patches are flooded annually: higher elevations receive flooding in more intermittent periods due to

5950-463: The plane is only very slightly lower than the sculpted elements. There is also sunk relief , which was mainly restricted to Ancient Egypt ( see below ). However, the distinction between high relief and low relief is the clearest and most important, and these two are generally the only terms used to discuss most work. The definition of these terms is somewhat variable, and many works combine areas in more than one of them, rarely sliding between them in

6035-467: The right to exploit the irrigated land. According to James Leten, a researcher, the project will reduce the area under deep inundation in the Inner Niger Delta by 43 percent. The area under deep inundation is crucial for pastoralists , because it is only there that Borgou ( Echinochloa stagnina ) grows, a plant which is particularly nutritious for cattle. Nomadic pastoralists come from as far away as Burkina Faso and Mauritania to allow their cattle to graze on

6120-499: The river Ger) might well come from the Berber phrase gr-n-grwn meaning "river of rivers", as the current Tuareg name for the river Niger. As Timbuktu was the southern end of the principal Trans-Saharan trade route to the western Mediterranean , it was the source of most European knowledge of the region. Medieval European maps applied the name Niger to the middle reaches of the river, in modern Mali, but Quorra ( Kworra ) to

6205-512: The river broadened and changed. Two of them reached the ocean on March 25, 1947, with Ponty having left the expedition at Niamey , somewhat past the halfway mark. They carried a 16mm movie camera , the resulting footage giving Rouch his first two ethnographic documentaries: "Au pays des mages noirs", and "La chasse à l’hippopotame". A camera was used to illustrate Rouch's subsequent book "Le Niger En Pirogue" (Fernand Nathan, 1954), as well as Sauvy's "Descente du Niger" (L'Harmattan, 2001). A typewriter

6290-528: The rivers are declining. In a similar way lack of control is also causing over-grazing. Finally the Selingue Dam and other water control projects affect the levels and seasonal behaviour of the rivers. Niger River This is an accepted version of this page (Period: 1971–2000)7,922.3 m /s (279,770 cu ft/s) The Niger River ( / ˈ n aɪ dʒ ər / NY -jər ; French : (le) fleuve Niger [(lə) flœv niʒɛʁ] )

6375-417: The round". Most ancient architectural reliefs were originally painted, which helped to define forms in low relief. The subject of reliefs is for convenient reference assumed in this article to be usually figures, but sculpture in relief often depicts decorative geometrical or foliage patterns, as in the arabesques of Islamic art , and may be of any subject. Rock reliefs are those carved into solid rock in

6460-544: The seasonal floods make the Delta extremely productive for both fishing and agriculture. The river loses nearly two-thirds of its potential flow in the Inner Delta between Ségou and Timbuktu to seepage and evaporation. The water from the Bani River , which flows into the Delta at Mopti , does not compensate for the losses. The average loss is estimated at 31 km /year but varies considerably between years. The river

6545-561: The south of Timbuktu and flowed south into the Gulf of Guinea. Over time upstream erosion by the lower Niger resulted in stream capture of the upper Niger by the lower Niger. The northern part of the river, known as the Niger bend , is an important area because it is the major river and source of water in that part of the Sahara. This made it the focal point of trade across the western Sahara and

6630-581: The southern reaches of the river tend to be Christian. Classical writings on the interior of the Sahara begin with Ptolemy , who mentions two rivers in the desert: the "Gir" (Γειρ) and farther south, the "Nigir" (Νιγειρ). The first has been since identified as the Wadi Ghir on the north-western edge of the Tuat , along the borders of modern Morocco and Algeria . This would likely have been as far as Ptolemy would have had consistent records. The Ni-Ger

6715-409: The surrounding area, which has a population of over 500,000. Most of the year the area has a hot and dry climate, with hot winds from the nearby Sahara raising the temperature up to 40 °C or 104 °F. During the wet season, which generally lasts from June to September but is longer the further south one goes, the swamp floods into a lake and naturally irrigates the land. When the dry season comes,

6800-463: The technique are described as "in relief", and, especially in monumental sculpture , the work itself is "a relief". Reliefs are common throughout the world on the walls of buildings and a variety of smaller settings, and a sequence of several panels or sections of relief may represent an extended narrative. Relief is more suitable for depicting complicated subjects with many figures and very active poses, such as battles, than free-standing "sculpture in

6885-725: The works usually being described as low relief instead. The typical traditional definition is that only up to half of the subject projects, and no elements are undercut or fully disengaged from the background field. The depth of the elements shown is normally somewhat distorted. Mid-relief is probably the most common type of relief found in the Hindu and Buddhist art of India and Southeast Asia . The low to mid-reliefs of 2nd-century BCE to 6th-century CE Ajanta Caves and 5th- to 10th-century Ellora Caves in India are rock reliefs. Most of these reliefs are used to narrate sacred scriptures, such as

6970-512: Was already the name of a river in West Africa, as mentioned by Pliny the Elder and Solinus, among others. Whether this river was the same as the actual Niger, or rather the river also known as Ger (currently known as Oued Guir, in Morocco), is a matter of discussion. This Nigris was said to divide "Africa proper" from the land of the (Western) Ethiopians to the south, and its name (as well as that of

7055-577: Was brought as well, on which Ponty produced newspaper articles he mailed out whenever possible. The water in the Niger River basin is partially regulated through dams. In Mali the Sélingué Dam on the Sankarani River is mainly used for hydropower but also permits irrigation. Two diversion dams, one at Sotuba just downstream of Bamako , and one at Markala , just downstream of Ségou , are used to irrigate about 54,000 hectares. In Nigeria

7140-479: Was likely speculation, although the name stuck as that of a river south of the Mediterranean's "known world". Suetonius reports Romans traveling to the "Ger", although in reporting any river's name derived from a Berber language, in which "gher" means "watercourse", confusion could easily arise. Pliny connected these two rivers as one long watercourse which flowed (via lakes and underground sections) into

7225-419: Was thought to be coastal wetlands. It was only with the 18th-century visits of Mungo Park , who travelled down the Niger River and visited the great Sahelian empires of his day, that Europeans correctly identified the course of the Niger and extended the name to its entire course. The modern nations of Nigeria and Niger take their names from the river, marking contesting national claims by colonial powers of

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