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Wadi Howar
Wadi Howar (Wadi Howa or Yellow Nile) is a wadi in Sudan and Chad. Geography Originating in the Ennedi Region of Chad ''Wadi Howar'' runs through the Sudanese states of North Darfur and Northern to join the Nile north of the great bend opposite Old Dongola. Stretching over 1100 km in west–east direction across the southern fringes of the Libyan Desert, it ordinarily receives 25 mm of rainfall per year. Holocene period ''Wadi Howar'' is the remnant of the ancient ''Yellow Nile'', a tributary of the Nile during the African humid period from about 9500 to 4500 years ago. At that time, savanna fauna and cattle herders occupied this region and the southern edge of the Sahara was some further north than it is today. When the Sahara underwent desertification between 6000 and 4000 years ago, the wadi Wadi ( ; ) is a river valley or a wet (ephemerality, ephemeral) Stream bed, riverbed that contains water only when heavy rain occurs. Wadis are located on gently ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nile
The Nile (also known as the Nile River or River Nile) is a major north-flowing river in northeastern Africa. It flows into the Mediterranean Sea. The Nile is the longest river in Africa. It has historically been considered the List of river systems by length, longest river in the world, though this has been contested by research suggesting that the Amazon River is slightly longer.Amazon Longer Than Nile River, Scientists Say Of the world's major rivers, the Nile has one of the lowest average annual flow rates. About long, its drainage basin covers eleven countries: the Democratic Republic of the Congo, Tanzania, Burundi, Rwanda, Uganda, Kenya, Ethiopia, Eritrea, South Sudan, Sudan, and Egypt. In pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Herder
A herder is a pastoralism, pastoral worker responsible for the care and management of a herd or flock of domestic animals, usually on extensive management, open pasture. It is particularly associated with nomadic pastoralism, nomadic or transhumant management of stock, or with common land grazing. The work is often done either on foot or riding animal, mounted. Depending on the type of animal being herd, the English language can give different professional names, for example, cowboy for cows, shepherd for sheep, or goatherd for goat. Terminology Herders may be distinguished by sex (''e.g.'', herdsman, herdswoman or herdboy) or by the type of livestock, for example camelherd, cowman (profession), cowherd, duckherd, goatherd or shepherd. By country China Tibetan herding communities living in the Tibetan Plateau in the Sichuan Province of southwest China continued to graze herds on common lands even after the 1982 Household responsibility system. Several reasons have been given ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Rivers Of Africa
International is an adjective (also used as a noun) meaning "between nations". International may also refer to: Music Albums * ''International'' (Kevin Michael album), 2011 * ''International'' (New Order album), 2002 * ''International'' (The Three Degrees album), 1975 *''International'', 2018 album by L'Algérino Songs * The Internationale, the left-wing anthem * "International" (Chase & Status song), 2014 * "International", by Adventures in Stereo from ''Monomania'', 2000 * "International", by Brass Construction from ''Renegades'', 1984 * "International", by Thomas Leer from ''The Scale of Ten'', 1985 * "International", by Kevin Michael from ''International'' (Kevin Michael album), 2011 * "International", by McGuinness Flint from ''McGuinness Flint'', 1970 * "International", by Orchestral Manoeuvres in the Dark from '' Dazzle Ships'', 1983 * "International (Serious)", by Estelle from '' All of Me'', 2012 Politics * Internationalism (politics) * Political international, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rivers Of Chad
This is a list of rivers in Chad. This list is arranged by drainage basin, with respective tributaries indented under each larger stream's name. Gulf of Guinea *''Niger River (Nigeria)'' **''Benue River (Nigeria)'' ***Mayo Kébbi Lake Chad *Chari River **Logone River ***Pendé River ***Mbéré River **Bahr Erguig **Bahr Salamat ***Bahr Azoum ****Ouadi Kadja **Ouham River ***Nana Barya **Bahr Kéita **Ko River ***Bragoto River **Bahr Aouk (Aoukalé) *Bahr el-Ghazal (wadi in Chad), Bahr el Ghazal Lake Fitri *Batha River Darfur *Wadi Howar References *Prentice-Hall, Inc., ''American World Atlas'' 1985 GEOnet Names Server {{Africa topic, List of rivers of Rivers of Chad, * Lists of rivers by country, Chad Lists of landforms of Chad, Rivers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rivers Of Sudan
A river is a natural stream of fresh water that flows on land or inside caves towards another body of water at a lower elevation, such as an ocean, lake, or another river. A river may run dry before reaching the end of its course if it runs out of water, or only flow during certain seasons. Rivers are regulated by the water cycle, the processes by which water moves around the Earth. Water first enters rivers through precipitation, whether from rainfall, the runoff of water down a slope, the melting of glaciers or snow, or seepage from aquifers beneath the surface of the Earth. Rivers flow in channeled watercourses and merge in confluences to form drainage basins, or catchments, areas where surface water eventually flows to a common outlet. Rivers have a great effect on the landscape around them. They may regularly overflow their banks and flood the surrounding area, spreading nutrients to the surrounding area. Sediment or alluvium carried by rivers shapes the landscape ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wadis Of Sudan
Wadi ( ; ) is a river valley or a wet (ephemeral) riverbed that contains water only when heavy rain occurs. Wadis are located on gently sloping, nearly flat parts of deserts; commonly they begin on the distal portions of alluvial fans and extend to inland sabkhas or dry lakes. Permanent channels do not exist, due to lack of continual water flow. Water percolates down into the stream bed, causing an abrupt loss of energy and resulting in vast deposition. Wadis may develop dams of sediment that change the stream patterns in the next flash flood. Wadis tend to be associated with centers of human population because sub-surface water is sometimes available in them. Nomadic and pastoral desert peoples will rely on seasonal vegetation found in wadis, even in regions as dry as the Sahara, as they travel in complex transhumance routes. The centrality of wadis to water – and human life – in desert environments gave birth to the distinct sub-field of wadi hydrology in the 1990s. E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Ptolemy
Lake Ptolemy is a former lake in Sudan. This lake formed during the Holocene in the Darfur region, during a time when the monsoon over Africa was stronger. The existence of the lake is dated between about 9,100–2,400 years before present. This lake could have reached a surface area of , larger than present-day Lake Erie, although estimates of its size vary and it might have been much smaller. The shorelines in some places, insofar as they are recognizable, feature riparian landscapes and reeds. The lake was a freshwater lake replenished by groundwater and runoff from neighbouring mountains and might itself have been the source for the Nubian Sandstone Aquifer System. The lake featured a diverse ecosystem with a number of species, and possibly facilitated the spread of species between the Nile and Lake Chad. Name and research history The lake's deposits were first recognized in 1985-1986, but the "chelonide marshes" or "turtle swamp" of Ptolemy almost certainly refer to the f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gala Abu Ahmed
Gala Abu Ahmed is a fortress ruin in lower Wadi Howar, northern Sudan. The facility is located west of the Nile. The fort was discovered in 1984 by archaeologists from the University of Cologne. It dates to the Kingdom of Kush's Napatan phase (ca. 750-350 BC). Radiocarbon dating Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for Chronological dating, determining the age of an object containing organic material by using the properties of carbon-14, radiocarbon, a radioactive Isotop ... suggests that the fortress was already in use around 1100 BC. The function of the building is still unclear. References * J. Eger; J. Helmbold-Doyé; T. Karberg: ''Osttor und Vorwerk der Festung Gala Abu Ahmed''. Bericht über die archäologischen Arbeiten der Kampagnen 2008/09 und 2009. In: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft Bd. 21. 2010, S. 71-85. (German language) * D. Eigner; F. Jesse: "Im Westen viel Neues - Die Grabun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ptolemy's World Map
The Ptolemy world map is a map of the world known to Greco-Roman societies in the 2nd century. It is based on the description contained in Ptolemy's book ''Geography'', written . Based on an inscription in several of the earliest surviving manuscripts, it is traditionally credited to Agathodaemon of Alexandria. Notable features of Ptolemy's map is the first use of longitudinal and latitudinal lines as well as specifying terrestrial locations by celestial observations. The ''Geography'' was translated from Greek into Arabic in the 9th century and played a role in the work of al-Khwārizmī before lapsing into obscurity. The idea of a global coordinate system revolutionized European geographical thought, however, and inspired more mathematical treatment of cartography. Ptolemy's work probably originally came with maps, but none have been discovered. Instead, the present form of the map was reconstructed from Ptolemy's coordinates by Byzantine monks under the direction of Maximus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Desertification
Desertification is a type of gradual land degradation of Soil fertility, fertile land into arid desert due to a combination of natural processes and human activities. The immediate cause of desertification is the loss of most vegetation. This is driven by a number of factors, alone or in combination, such as drought, climatic shifts, tillage for agriculture, overgrazing and deforestation for fuel or construction materials. Though vegetation plays a major role in determining the Soil biology, biological composition of the soil, studies have shown that, in many environments, the rate of erosion and runoff decreases exponentially with increased vegetation cover. Unprotected, dry soil surfaces blow away with the wind or are washed away by flash floods, leaving infertile lower soil layers that bake in the sun and become an unproductive hardpan. At least 90% of the inhabitants of drylands live in Developing country, developing countries, where they also suffer from poor economic and s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sahara
The Sahara (, ) is a desert spanning across North Africa. With an area of , it is the largest hot desert in the world and the list of deserts by area, third-largest desert overall, smaller only than the deserts of Antarctica and the northern Arctic. The name "Sahara" is derived from , a broken plural form of ( ), meaning "desert". The desert covers much of North Africa, excluding the fertile region on the Mediterranean Sea coast, the Atlas Mountains of the Maghreb, and the Nile, Nile Valley in Egypt and the Sudan. It stretches from the Red Sea in the east and the Mediterranean in the north to the Atlantic Ocean in the west, where the landscape gradually changes from desert to coastal plains. To the south it is bounded by the Sahel, a belt of Tropical and subtropical grasslands, savannas, and shrublands, semi-arid tropical savanna around the Niger River valley and the Sudan (region), Sudan region of sub-Saharan Africa. The Sahara can be divided into several regions, including ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Savanna
A savanna or savannah is a mixed woodland-grassland (i.e. grassy woodland) biome and ecosystem characterised by the trees being sufficiently widely spaced so that the canopy does not close. The open canopy allows sufficient light to reach the ground to support an unbroken herbaceous layer consisting primarily of grasses. Four savanna forms exist; ''savanna woodland'' where trees and shrubs form a light canopy, ''tree savanna'' with scattered trees and shrubs, ''shrub savanna'' with distributed shrubs, and ''grass savanna'' where trees and shrubs are mostly nonexistent.Smith, Jeremy M.B.. "savanna". Encyclopedia Britannica, 5 Sep. 2016, https://www.britannica.com/science/savanna/Environment. Accessed 17 September 2022. Savannas maintain an open canopy despite a high tree density. It is often believed that savannas feature widely spaced, scattered trees. However, in many savannas, tree densities are higher and trees are more regularly spaced than in forests.Manoel Cláudio da ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
