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Adrar Afao
Jebel Azao or Adrar Afao, at , is the highest peak in the Tassili n'Ajjer range in southeastern Algeria. The range forms the northwest border of the Chad Basin. Geography The Jebel Azao is a peak in the Adrar massif of the Tassili N'Ajjer, a sandstone plateau to the northeast of the Hoggar Mountains The mountain forms a ridge on the plateau, roughly parallel to the escarpment. The massif is mainly made of sandstone, which has resulted in the formation of many natural rock arches. Mt. Afao is drained by various wadis, which converge on the Wadi Imirhou. This wadi runs northeast, then turns to the northwest and disappears in the Issaouane Erg sands to the west of Illizi Illizi (Amazigh language: Ilizi) is an Algerian town and Communes of Algeria, commune, coextensive with Illizi District, situated in the south-eastern part of Algeria, and capital of Illizi Province. According to the 2008 census it is the largest .... References Citations Sources * * * {{Mountains of Alger ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Tassili N'Ajjer
Tassili n'Ajjer (Berber: ''Tassili n Ajjer'', ; "Plateau of rivers") is a mountain range in the Sahara desert, located in south-eastern Algeria. It holds one of the most important groupings of prehistoric cave art in the world, and covers an area of more than , The site has been designated a national park and a Biosphere Reserve, and was inducted into the UNESCO World Heritage Site list in 1982. The literal English translation of ''Tassili n'Ajjer'' is 'plateau of rivers'. Geography Tassili n'Ajjer is a plateau in south-eastern Algeria at the borders of Libya and Nigeri, covering an area of 72,000 km2. It ranges from east-south-east to . Its highest point is the Adrar Afao that peaks at , located at . The nearest town is Djanet, about to the south-west. The plateau is of great geological and aesthetic interest. Its panorama of geological formations of rock forests, composed of eroded sandstone, resembles a lunar landscape and hosts a range of rock art styles. Geolog ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Chad Basin
The Chad Basin is the largest endorheic basin in Africa, centered approximately on Lake Chad. It has no outlet to the sea and contains large areas of semi-arid desert and savanna. The drainage basin is approximately coterminous with the sedimentary basin of the same name, but extends further to the northeast and east. The basin spans four modern nations, including most of Chad and a large part of Niger, Nigeria and Cameroon. A combination of dams, increased irrigation, climate change, and reduced rainfall are causing water shortages. Lake Chad continues to shrink. Geology The geological basin, which is smaller than the drainage basin, is a Phanerozoic sedimentary basin formed during the plate divergence that opened the South Atlantic Ocean. The basin lies between the West African craton, West African Craton and Congo craton, Congo Craton, and formed about the same time as the Benue Trough. It covers an area of about . It merges into the Iullemmeden Basin to the west at the Dame ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Hoggar Mountains
The Hoggar Mountains (; Berber: ''idurar n Ahaggar'') are a highland region in the central Sahara in southern Algeria, along the Tropic of Cancer. The mountains cover an area of approximately 550,000 km2. The Hoggar Mountains are home to the Ahaggar National Park. The tallest peak in the range and Algeria, Mount Tahat, is located in the park area, which covers approximately . Geography This mountainous region is located about south of the capital, Algiers. The area is largely rocky desert with an average elevation of more than above sea level. The highest peak, Mount Tahat, is at . The mountains are primarily composed of metamorphic rock approximately 2 billion years old, although there are areas where more recent volcanic activity has laid down much newer rock. Several of the more dramatic peaks, such as Ilamen, are the result of erosion wearing away extinct volcano domes, leaving behind the more resistant material that plugged the volcanic cones. Assekrem is a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
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 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 h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Wadi Imirhou
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. Et ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Issaouane Erg
The Issaouane Erg (also called Issaouane-N-Irrararene) is an approximately 38,000 km2 erg (sand sea) in Algeria's portion of the Sahara desert. Topography The Issaouane Erg is located near the Ahaggar Mountains. It is part of a major dune field that extends from Issaouane Erg in the north to the Sudanese Erg in the south, flanked by the Libyan erg of Murzuq. In the north, the Issaouane Erg ends at the Tinrhert Plateau and in the south at the Fadnoun Plateau. To a large extent it follows the 500-m contour of the surrounding landscape, ergs mostly being confined to basins. Sand in the Issaouane Erg, below the level of the sand dunes, has accumulated to a depth of 20 to 30 meters. It has barchan dunes as well as star dunes of 300 to 430 meters high. The presence of both barchan dunes (which form due to unidirectional winds) and star dunes (which form when winds from various directions deposit sand) "suggests that wind regimes have changed over time". NASA's ''Earth Observato ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Illizi
Illizi (Amazigh language: Ilizi) is an Algerian town and Communes of Algeria, commune, coextensive with Illizi District, situated in the south-eastern part of Algeria, and capital of Illizi Province. According to the 2008 census it is the largest commune by population in the province, with a population of 17,252, up from 10,163 in 1998, and an annual population growth rate of 5.5%, the highest in the province. It is one of the gates to the Tassili N'Ajjer National Park with caves and partly enclosed rock shelters containing rock art, prehistoric drawings dating from 6000 years BC. There are a hotel and two camping sites, as well as many local tourist agencies. During French colonial rule, the town was called Fort Polignac (1909–1962). DRAG Illizi مديرية التنظيم و الشؤون العامة باليزي - panoramio.jpg, Public Services Directorate of Illizi Illizi - مدرسة بن باديس اليزي - panoramio.jpg, Ibn Badis School Illizi Illizi عنزي ال ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
