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Lakes Of Ounianga
Lakes of Ounianga are a series of lakes in the Sahara Desert, in North-Eastern Chad, occupying a basin in the mountains of West Tibesti and Ennedi East. It was added as a UNESCO World Heritage site in 2012. According to the UNESCO description, the lakes are in a hot and hyperarid desert that features a rainfall of less than a year. The lakes exhibit a variety of sizes, depths, chemical compositions and colorations. There is a total of 18 lakes in groups as follows: * Ounianga Kébir group: Lake Yoa, Lake Katam, Lake Oma (or Ouma), Lake Béver, Lake Midji, Lake Forodom; * Lake Motro, about southeast of Ounianga Kébir; * Ounianga Sérir group about southeast of Ounianga Kébir: Lake Melekui, Lake Dirke, Lake Ardjou, Lake Téli, Lake Obrom, Lake Élimé, Lake Hogo, Lake Djiara, Lake Ahoita, Lake Daléyala, and Lake Boukkou. The total surface area of the lakes is about . The largest of the lakes, Lake Yoa, has about a area and attains in depth. The names of the lake grou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ennedi (region)
Ennedi Region was a former region of Chad. It was created in 2008 from the Ennedi Est Department and Ennedi Ouest Department of the former Borkou-Ennedi-Tibesti Region. The capital of the Ennedi region was Fada. In 2012 it was split into two new regions: the department of Wadi Hawar became Ennedi-Est Region and the department of Ennedi became Ennedi-Ouest Region. Per the census of 2009, the population of the region was 173,606, 45.20 per cent female. The total number of households was 24,784: 23,977 in rural areas and 807 in urban areas. The number of nomads in the region was 27,759, 7.20 per cent of the population. The sex ratio was 121.00 females for every hundred males. Demographics Per the census of 2009, the population of the region was 173,606, 45.20 per cent female. The average size of household as of 2009 is 5.90: 5.90 in rural households and 5.40 in urban areas. The total number of households was 24,784: 23,977 in rural areas and 807 in urban areas. The number of no ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chad
Chad (; ar, تشاد , ; french: Tchad, ), officially the Republic of Chad, '; ) is a landlocked country at the crossroads of North and Central Africa. It is bordered by Libya to the north, Sudan to the east, the Central African Republic to the south, Cameroon to the southwest, Nigeria to the southwest (at Lake Chad), and Niger to the west. Chad has a population of 16 million, of which 1.6 million live in the capital and largest city of N'Djamena. Chad has several regions: a desert zone in the north, an arid Sahelian belt in the centre and a more fertile Sudanian Savanna zone in the south. Lake Chad, after which the country is named, is the second-largest wetland in Africa. Chad's official languages are Arabic and French. It is home to over 200 different ethnic and linguistic groups. Islam (55.1%) and Christianity (41.1%) are the main religions practiced in Chad. Beginning in the 7th millennium BC, human populations moved into the Chadian basin in great numbe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ounianga Lakes From ISS , Chad
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Ounianga Kebir may refer to * Ounianga Kébir (town), Chad * Lakes of Ounianga Lakes of Ounianga are a series of lakes in the Sahara Desert, in North-Eastern Chad, occupying a basin in the mountains of West Tibesti and Ennedi East. It was added as a UNESCO World Heritage site in 2012. According to the UNESCO description, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sahara Desert
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Tibesti Mountains
The Tibesti Mountains are a mountain range in the central Sahara, primarily located in the extreme north of Chad, with a small portion located in southern Libya. The highest peak in the range, Emi Koussi, lies to the south at a height of and is the highest point in both Chad and the Sahara. Bikku Bitti, the highest peak in Libya, is located in the north of the range. The central third of the Tibesti is of volcanic origin and consists of five volcanoes topped by large depressions: Emi Koussi, Tarso Toon, Tarso Voon, Tarso Yega and Toussidé. Major lava flows have formed vast plateaus that overlie Paleozoic sandstone. The volcanic activity was the result of a continental hotspot that arose during the Oligocene and continued in some places until the Holocene, creating fumaroles, hot springs, mud pools and deposits of natron and sulfur. Erosion has shaped volcanic spires and carved an extensive network of canyons through which run rivers subject to highly irregular flows that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ennedi Region
Ennedi Region was a former region of Chad. It was created in 2008 from the Ennedi Est Department and Ennedi Ouest Department of the former Borkou-Ennedi-Tibesti Region. The capital of the Ennedi region was Fada. In 2012 it was split into two new regions: the department of Wadi Hawar became Ennedi-Est Region and the department of Ennedi became Ennedi-Ouest Region. Per the census of 2009, the population of the region was 173,606, 45.20 per cent female. The total number of households was 24,784: 23,977 in rural areas and 807 in urban areas. The number of nomads in the region was 27,759, 7.20 per cent of the population. The sex ratio was 121.00 females for every hundred males. Demographics Per the census of 2009, the population of the region was 173,606, 45.20 per cent female. The average size of household as of 2009 is 5.90: 5.90 in rural households and 5.40 in urban areas. The total number of households was 24,784: 23,977 in rural areas and 807 in urban areas. The number of no ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Yoa
Lake Yoa is the most famous, and second largest of the Lakes of Ounianga, a series of Lakes in Borkou-Ennedi-Tibesti Region basin of northeastern Chad. It is located in the Ounianga Kebir about 40 km west of Ounianga Sarir. These lakes are remnants of a much larger lake which occupied this basin during the African Humid period which lasted from approximately 15,000 to 5,500 years before present. There are currently 15 lakes in the basin with a total surface area of approximately square. Climate change Lake Yoa recently became of interest in the study of global climate trends when a team headed by Stefan Kröpelin, of the |
Lake Katam
The Lake Katam is one of the larger lakes in Ounianga Kebir, a lake system in the Borkou-Ennedi-Tibesti Region in the north-east basin of Chad. These lakes are notable for their running in the north–south headlands, by the Trade wind The trade winds or easterlies are the permanent east-to-west prevailing winds that flow in the Earth's equatorial region. The trade winds blow mainly from the northeast in the Northern Hemisphere and from the southeast in the Southern Hemisph ... are formed. They are the remnant of a much larger lake, that filled the basin during the so-called green Sahara-time, which lasted from about BC 10000–1500. See also * Lake Yoa * Lakes of Ounianga Katam {{Chad-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aquifer
An aquifer is an underground layer of water-bearing, permeable rock, rock fractures, or unconsolidated materials (gravel, sand, or silt). Groundwater from aquifers can be extracted using a water well. Aquifers vary greatly in their characteristics. The study of water flow in aquifers and the characterization of aquifers is called hydrogeology. Related terms include aquitard, which is a bed of low permeability along an aquifer, and aquiclude (or ''aquifuge''), which is a solid, impermeable area underlying or overlying an aquifer, the pressure of which could create a confined aquifer. The classification of aquifers is as follows: Saturated versus unsaturated; aquifers versus aquitards; confined versus unconfined; isotropic versus anisotropic; porous, karst, or fractured; transboundary aquifer. Challenges for using groundwater include: overdrafting (extracting groundwater beyond the Dynamic equilibrium, equilibrium yield of the aquifer), groundwater-related subsidence of land, gro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salinity
Salinity () is the saltiness or amount of salt dissolved in a body of water, called saline water (see also soil salinity). It is usually measured in g/L or g/kg (grams of salt per liter/kilogram of water; the latter is dimensionless and equal to ‰). Salinity is an important factor in determining many aspects of the chemistry of natural waters and of biological processes within it, and is a thermodynamic state variable that, along with temperature and pressure, governs physical characteristics like the density and heat capacity of the water. A contour line of constant salinity is called an ''isohaline'', or sometimes ''isohale''. Definitions Salinity in rivers, lakes, and the ocean is conceptually simple, but technically challenging to define and measure precisely. Conceptually the salinity is the quantity of dissolved salt content of the water. Salts are compounds like sodium chloride, magnesium sulfate, potassium nitrate, and sodium bicarbonate which dissolve into ions ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Teli
A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much larger oceans, they do form part of the Earth's water cycle. Lakes are distinct from lagoons, which are generally coastal parts of the ocean. Lakes are typically larger and deeper than ponds, which also lie on land, though there are no official or scientific definitions. Lakes can be contrasted with rivers or streams, which usually flow in a channel on land. Most lakes are fed and drained by rivers and streams. Natural lakes are generally found in mountainous areas, rift zones, and areas with ongoing glaciation. Other lakes are found in endorheic basins or along the courses of mature rivers, where a river channel has widened into a basin. Some parts of the world have many lakes formed by the chaotic drainage patterns left over from the last ice ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reed (plant)
Reed is a common name for several tall, grass-like plants of wetlands. Varieties They are all members of the order Poales (in the modern, expanded circumscription), and include: In the grass family, Poaceae * Common reed (''Phragmites australis''), the original species named reed * Giant reed (''Arundo donax''), used for making reeds for musical instruments * Burma reed (''Neyraudia reynaudiana'') * Reed canary-grass (''Phalaris arundinacea'') * Reed sweet-grass (''Glyceria maxima'') * Small-reed (''Calamagrostis'' species) In the sedge family, Cyperaceae * Paper reed or papyrus ('' Cyperus papyrus''), the source of the Ancient Egyptian writing material, also used for making boats In the family Typhaceae * Bur-reed (''Sparganium'' species) * Reed-mace (''Typha'' species), also called bulrush or cattail In the family Restionaceae * Cape thatching reed ('' Elegia tectorum''), a restio originating from the South-western Cape, South Africa. * Thatching reed (''Thamnochortus ins ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
