| Lake Abijatta | |
|---|---|
 Lake Abijatta (right) and Lake Shala (left) | |
  Lake Abijatta | |
 | |
| Coordinates | 7°37′N38°36′E / 7.617°N 38.600°E |
| Basin countries | Ethiopia |
| Max. length | 17 km (11 mi) |
| Max. width | 15 km (9.3 mi) |
| Surface area | 205 km2 (79 sq mi) |
| Max. depth | 14 m (46 ft) |
| Surface elevation | 1,573 m (5,161 ft) |
Lake Abijatta is an alkaline lake in Ethiopia. It lies in the Main Ethiopian Rift valley south of Addis Ababa, in the Abijatta-Shalla National Park.
According to the Statistical Abstract of Ethiopia for 1967/68, the lake is 17 kilometers long and 15 km wide, with a surface area of 205 square kilometers. It has a maximum depth of 14 meters and is at an elevation of 1,573 meters.
Along the northeastern corner of this lake are a number of hot springs, which are important both as a tourist attraction and to the local inhabitants.
Additionally, there is a soda ash operation on the shores of this lake, which produces 20,000 tons of sodium carbonate. Proven reserves at Lake Abijata, as well as the neighboring Shala and Chitu lakes, exceed 460 million tons. [1] Flamingoes are also found at the lake.
Multidisciplinary studies, including the examination of sedimentology, palynology, diatoms and organic matter have been undertaken on a 6 m core from Lake Abijata, Ethiopia. The bottom of this core has been dated at 1720 ± BP. Analyses have shown four distinct stages in lake evolution. Two transgressive phases that have been recognized can be correlated with other lake level evidence. The transgressions result from changing inputs from lowland and highland regions within the catchment. They are most probably related to changes in seasonal rainfall patterns. [2]
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The Great Rift Valley is a series of contiguous geographic depressions, approximately 7,000 kilometres (4,300 mi) in total length, that runs from Lebanon in Asia to Mozambique in Southeast Africa. While the name continues in some usages, it is rarely used in geology as it is considered an imprecise merging of separate though related rift and fault systems.
Ethiopia is located in the Horn of Africa. It is bordered by Eritrea to the north, Djibouti and Somalia to the east, Sudan and South Sudan to the west, and Kenya to the south. Ethiopia has a high central plateau, the Abyssinian Highlands that varies from 1,290 to 3,000 m above sea level, with some 25 mountains whose peaks rise over 4,000 meters (13,200ft), the highest being Ras Dashen at 4,543 meters (14,538ft).
A rift valley is a linear shaped lowland between several highlands or mountain ranges produced by the action of a geologic rift. Rifts are formed as a result of the pulling apart of the lithosphere due to extensional tectonics. The linear depression may subsequently be further deepened by the forces of erosion. More generally the valley is likely to be filled with sedimentary deposits derived from the rift flanks and the surrounding areas. In many cases rift lakes are formed. One of the best known examples of this process is the East African Rift. On Earth, rifts can occur at all elevations, from the sea floor to plateaus and mountain ranges in continental crust or in oceanic crust. They are often associated with a number of adjoining subsidiary or co-extensive valleys, which are typically considered part of the principal rift valley geologically.
Lake Abaya is a lake in the Southern Nations, Nationalities, and Peoples' Region of Ethiopia. It is located in the Main Ethiopian Rift, east of the Guge Mountains.
The Rift Valley lakes are a series of lakes in the East African Rift valley that runs through eastern Africa from Ethiopia in the north to Malawi in the south, and includes the African Great Lakes in the south. These include some of the world's oldest lakes, deepest lakes, largest lakes by area, and largest lakes by volume. Many are freshwater ecoregions of great biodiversity, while others are alkaline "soda lakes" supporting highly specialised organisms.
The Awash is a major river of Ethiopia. Its course is entirely contained within the boundaries of Ethiopia and empties into a chain of interconnected lakes that begin with Lake Gargori and end with Lake Abbe on the border with Djibouti, some 100 kilometres from the head of the Gulf of Tadjoura. It is the principal stream of an endorheic drainage basin covering parts of the Amhara, Oromia and Somali Regions, as well as the southern half of the Afar Region.
The East African Rift (EAR) or East African Rift System (EARS) is an active continental rift zone in East Africa. The EAR began developing around the onset of the Miocene, 22–25 million years ago. It was formerly considered to be part of a larger Great Rift Valley that extended north to Asia Minor.
The Afar Triangle is a geological depression caused by the Afar Triple Junction, which is part of the Great Rift Valley in East Africa. The region has disclosed fossil specimens of the very earliest hominins; that is, the earliest of the human clade, and it is thought by some paleontologists to be the cradle of the evolution of humans. The Depression overlaps the borders of Eritrea, Djibouti and the entire Afar Region of Ethiopia; and it contains the lowest point in Africa, Lake Assal, Djibouti, at 155 m (509 ft) below sea level.
Lake Shala is an alkaline lake located in the Ethiopian Rift Valley, in the Abijatta-Shalla National Park.
Abijatta-Shalla National Park is a national park in Ethiopia. It is located in the Oromia Region and the Ethiopian Highlands region, 200 kilometers south of Addis Ababa, and east of the Batu–Shashamane highway.
Lake Langano is a lake in the Oromia Region of Ethiopia, exactly 200 kilometers by road south of the capital, Addis Ababa, on the border between the East Shewa Zone and Arsi Zones. It is located to the east of Lake Abijatta in the Main Ethiopian Rift at an elevation of 1,585 meters.
Adami Tullu and Jido Kombolcha is one of the districts in the Oromia Region of Ethiopia. Part of the East Shewa Zone located in the Great Rift Valley, Adami Tullu and Jido Kombolcha is bordered on the south by West Arsi Zone with which it shares the shores of Lakes Abijatta and Langano, on the west by the Silte Zone of Southern Nations, Nationalities and Peoples Region, on the north by Dugda Bora, on the northeast by Hora-Dambal, and on the east by the Arsi Zone. The main town of district is Adami Tullu; other towns include Abosa, Bulbulla, and Jido.
Arsi Negele is a woreda in Oromia Region, Ethiopia. It is named after its administrative center, Arsi Negele. Part of the West Arsi Zone located in the Great Rift Valley, Arsi Negele is bordered on the south by Naannawa Shashamane and Kofale, on the southwest by Lake Shala which separates it from Shala, on the west by the Southern Nations, Nationalities and Peoples Region, on the north by East Shewa with which it shares the shores of Lakes Abijatta and Langano, and on the east by the Heban Arsi, Qore woreda and small portion by Arsi Zone.
Lake Afrera is a hypersaline lake in northern Ethiopia. Located in Kilbet Rasu, Afar Region, it is one of the lakes of the Danakil Depression. According to its entry in Lakenet, it has a surface area of 100 km2 (39 sq mi), although another source states the area is 125 km2 (48 sq mi). An unconfirmed report gives its depth as 160 m (525 ft); the lake is fed by underground streams.
The Ethiopian hare is a species of mammal in the family Leporidae. It was first described in 1903, by the British mammalogist Oldfield Thomas. The dorsal pelage is brownish buff, and is finely grizzled with black. The ventral pelage is fluffy and white in colour. Endemic to Ethiopia, it is found in the Afromontane Biozone of Ethiopia, and in the borders of the Sudanian Savanna Biozone. It is rated as a least concern species by the International Union for Conservation of Nature.
The Great Rift Valley of Ethiopia, is a branch of the East African Rift that runs through Ethiopia in a southwest direction from the Afar Triple Junction. In the past, it was seen as part of a "Great Rift Valley" that ran from Mozambique to Syria.
The Great Rift Valley is part of an intra-continental ridge system that runs through Kenya from north to south. It is part of the Gregory Rift, the eastern branch of the East African Rift, which starts in Tanzania to the south and continues northward into Ethiopia. It was formed on the "Kenyan Dome" a geographical upwelling created by the interactions of three major tectonics: the Arabian, Nubian, and Somalian plates. In the past, it was seen as part of a "Great Rift Valley" that ran from Madagascar to Syria. Most of the valley falls within the former Rift Valley Province.
The greater Turkana Basin in East Africa determines a large endorheic basin, a drainage basin with no outflow centered around the north-southwards directed Gregory Rift system in Kenya and southern Ethiopia. The deepest point of the basin is the endorheic Lake Turkana, a brackish soda lake with a very high ecological productivity in the Gregory Rift.
The geology of Tanzania began to form in the Precambrian, in the Archean and Proterozoic eons, in some cases more than 2.5 billion years ago. Igneous and metamorphic crystalline basement rock forms the Archean Tanzania Craton, which is surrounded by the Proterozoic Ubendian belt, Mozambique Belt and Karagwe-Ankole Belt. The region experienced downwarping of the crust during the Paleozoic and Mesozoic, as the massive Karoo Supergroup deposited. Within the past 100 million years, Tanzania has experienced marine sedimentary rock deposition along the coast and rift formation inland, which has produced large rift lakes. Tanzania has extensive, but poorly explored and exploited natural resources, including coal, gold, diamonds, graphite and clays.
The geology of Afghanistan includes nearly one billion year old rocks from the Precambrian. The region experienced widespread marine transgressions and deposition during the Paleozoic and Mesozoic, that continued into the Cenozoic with the uplift of the Hindu Kush mountains.