Английская Википедия:Geography of Ethiopia

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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 (or Ethiopian Highlands) that varies from Шаблон:Convert 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).[1]

Elevation is generally highest just before the point of descent to the Great Rift Valley, which splits the plateau diagonally. A number of rivers cross the plateau; notably the Blue Nile rising from Lake Tana. The plateau gradually slopes to the lowlands of the Sudan on the west and the Somali-inhabited plains to the east. Ethiopia's westernmost locality is Pibor River opposite the Sudanese village of Denjok. Its easternmost locality lies along the eastern border of Dollo Zone opposite Puntland and Galmudug states.

Physical features

Geography

Файл:Ethiopia Topography.png
Ethiopia's topography
Файл:Ethiopia sat.png
A satellite image of Ethiopia

Between the valley of the Upper Nile and Ethiopia's border with Sudan and South Sudan is a region of elevated plateaus from which rise the various tablelands and mountains that constitute the Ethiopian Highlands. On nearly every side, the walls of the plateaus rise abruptly from the plains, constituting outer mountain chains. The highlands are thus a clearly marked geographic division. In Eritrea, the eastern wall of this plateau runs parallel to the Red Sea from Ras Kasar (18° N) to Annesley Bay (also known as the Bay of Zula) (15° N). It then turns due south into Ethiopia and follows closely the line of 40° E for some Шаблон:Convert.Шаблон:Sfn

About 9° N there is a break in the wall, through which the Awash River flows eastward. The main range at this point trends southwest, while south of the Awash Valley, which is some Шаблон:Convert below the level of the mountains, another massif rises in a direct line south. This second range sends a chain (the Ahmar Mountains) eastward toward the Gulf of Aden.Шаблон:Sfn

The two chief eastern ranges maintain a parallel course south by west, with a broad upland valley in between – in which valley are a series of lakes – to about 3° N, the outer (eastern) spurs of the plateau still keeping along the line of 40° E. The southern escarpment of the plateau is highly irregular, but has a general direction northwest and southeast from 6° N to 3° N. It overlooks the depression in which is Lake Turkana and – east of that lake – the southern Debub Omo Zone (part of the larger Southern Nations, Nationalities, and Peoples Region).Шаблон:Sfn

The western wall of the plateau from 6° N to 11° N is well marked and precipitous. North of 11° N the hills turn more to the east and fall more gradually to the East Sudanian savanna plains at their base. On its northern face, the plateau falls in terraces to the level of the eastern Sudan.

Файл:Awash River Valley, Asaita, Afar, Ethiopia.JPG
Awash river valley.

The eastern escarpment is the best defined of these outer ranges. It has a mean height of Шаблон:Convert, and in many places rises almost perpendicularly from the plain. Narrow and deep clefts, through which descend mountain torrents that lose themselves in the sandy soil of the Eritrean coast, afford means of reaching the plateau, or the easier route through the Awash Valley may be chosen. On surmounting this rocky barrier, the traveller finds that the encircling rampart rises little above the normal level of the plateau.Шаблон:Sfn

The physical aspect of the highlands is impressive. The northern portion lies mainly between 10° and 15° N. It consists of a huge mass of Archaean rocks with a mean height of Шаблон:Convert above sea level, and is flooded in a deep central depression by the waters of Lake Tana. Above the plateau rise several irregular and generally ill-defined mountain ranges which attain altitudes of from Шаблон:Convert to just under Шаблон:Convert. Many of the mountains are of unusual shape.Шаблон:Sfn

Characteristic of the country are the enormous fissures which divide it, formed over time by the erosive action of water. They are the valleys of the rivers, which rising on the uplands or mountain sides, have cut their way to the surrounding lowlands. Some of the valleys are of considerable width; in other cases the opposite walls of the gorges are but two or three hundred meters apart, and fall almost vertically thousands of meters, representing an erosion of many hundred thousands cubic metres of hard rock. One result of the action of the water has been the formation of numerous isolated flat-topped hills or small plateaus, known as ambas, with nearly perpendicular sides.Шаблон:Sfn

The highest peaks are found in the Semien and Bale ranges. The Semien Mountains lie northeast of Lake Tana and culminate in the snow-covered peak of Ras Dashen, which has an altitude of Шаблон:Convert. A few kilometers east and north respectively of Ras Dashen are Mounts Biuat and Abba Yared, whose summits are less than Шаблон:Convert below that of Ras Dashen.Шаблон:Sfn

The Bale Mountains are separated from the larger part of the Ethiopian highlands by the Great Rift Valley, one of the longest and most profound chasms in Ethiopia. The highest peaks of that range include Tullu Demtu, the second-highest mountain in Ethiopia (Шаблон:Convert), Batu (Шаблон:Convert), Chilalo (Шаблон:Convert) and Mount Kaka (Шаблон:Convert).

Parallel with the eastern escarpment are the heights of Biala, Шаблон:Convert, Mount Abuna Yosef, Шаблон:Convert, and Kollo, Шаблон:Convert, the last-named being southwest of Magdala. Between Lake Tana and the eastern hills are Mounts Guna, Шаблон:Convert, and Uara Sahia, Шаблон:Convert.Шаблон:Sfn In the Choqa Mountains of Misraq Gojjam, Mount Choqa (also known as Mount Birhan) attains a height of Шаблон:Convert.

Below 10° N, the southern portion of the highlands has more open tableland than the northern portion and fewer lofty peaks. Though there are a few heights between Шаблон:Convert, the majority do not exceed Шаблон:Convert, but the general character of the southern regions is the same as in the north: a much-broken hilly plateau.Шаблон:Sfn

East of the highlands towards the Red Sea there is a strip of lowland semi-desert, the Ethiopian xeric grasslands and shrublands.

Hydrology

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Файл:Ethiopia Hydrogeology3.png
Hydrogeology map of Ethiopia

Most of the Ethiopian uplands have a decided slope to the northwest, so that nearly all the large rivers flow in that direction to the Nile, comprising some 85% of its water. Such are the Tekezé River in the north, the Abay in the center, and the Sobat in the south, and about four-fifths of the entire drainage is discharged through these three arteries. Another large river is the south-flowing Omo, with 14% of the entire drainage the largest river outside the above-mentioned three main arteries discharging to the west, and by far the main feeder of the endorheic Turkana Basin with Lake Turkana. The rest is carried off by the Awash, which runs out in the saline lacustrine district along the border with Djibouti; by the Shebelle River and the Jubba, which flow southeast through Somalia, though the Shebelle most often fails to reach the Indian Ocean.Шаблон:Sfn

The Tekezé River, which is the true upper course of the Atbarah River, has its headwaters in the central tableland; and falls from about Шаблон:Convert. in the tremendous crevasse through which it sweeps west, north, forming part of the border with Eritrea, and west again down to the western terraces, where it passes from Ethiopia to Sudan. During the rains the Tekezé (i.e. the "Terrible") rises some Шаблон:Convert above its normal level, and at this time forms an impassable barrier between the northern and central regions. In its lower course, the river is known by the Arabic name Setit.Шаблон:Sfn

Файл:Jubbarivermap.png
A map of the Jubba River and Shebelle River drainage basin

In Sudan, the Setit is joined (at Шаблон:Coord) by the Atbarah, a river formed by several streams which rise in the mountains west and northwest of Lake Tana. The Gash or Mareb, which forms part of the border with Eritrea, is the most northerly of the highland rivers which flow toward the Nile valley. Its headwaters rise on the landward side of the eastern escarpment within 80 km of Annesley Bay on the Red Sea. It reaches the Sudanese plains near Kassala, beyond which place its waters are dissipated in the sandy soil. The Mareb is dry for a great part of the year, but like the Takazze is subject to sudden freshets during the rainy season. Only the left bank of the upper course of the river is in Ethiopian territory.Шаблон:Sfn The Abay – that is, the upper course of the Blue Nile – has its source near Mount Denguiza in the Choqa mountains, around Шаблон:Coord. It first flows for Шаблон:Convert nearly due north to the south shore of Lake Tana. Tana, which stands Шаблон:Convert below the normal level of the plateau, has somewhat the physical aspect of a flooded crater. It has an area of about Шаблон:Convert, and a depth in some parts of Шаблон:Convert. At the southeast corner the rim of the crater is, as it were, breached by a deep crevasse through which the Abay escapes, and here makes a great semicircular bend like that of the Tekezé, but in the reverse direction – east, south and north-west – down to the plains of Sennar, where it takes the name of Bahr-el-Azrak or Blue Nile.Шаблон:Sfn

Файл:Awashrivermap.png
A map of the Awash River

The Abay has many tributaries. Of these, the Bashilo rises near Magdala and drains eastern Amhara; the Jamma rises near Ankober and drains northern Shoa; the Muger rises near Addis Ababa and drains south-western Shoa; the Didessa, the largest of the Abay's affluents, rises in the Kaffa hills and has a generally south-to-north course; the Dabus runs near the western edge of the plateau escarpment. All these are perennial rivers. The right-hand tributaries, rising mostly on the western sides of the plateau, have steep slopes and are generally torrential in character. The Beles, however, is perennial, and the Rahad and Dinder are important rivers in flood-time.Шаблон:Sfn

In the mountains and plateaus of Gambela and Kaffa in southwestern Ethiopia rise the Baro, Gelo, Akobo and other chief affluents of the Sobat tributary of the Nile. The Akobo, in about Шаблон:Coord, joins the Pibor, which in about Шаблон:Coord unites with the Baro, the river below the confluence taking the name of Sobat. These rivers descend from the mountains in great falls, and like the other Ethiopian streams are unnavigable in their upper courses. The Baro on reaching the plain becomes, however, a navigable stream affording an open waterway to the Nile. The Baro, Pibor and Akobo form for Шаблон:Convert the western and southwestern frontiers of Ethiopia.Шаблон:Sfn

The chief river of Ethiopia flowing east is the Awash River (or Awasi), which rises in the Shewan uplands and makes a semicircular bend first southeast and then northeast. It reaches the Afar Depression through a broad breach in the eastern escarpment of the plateau, beyond which it is joined on its left bank by its chief affluent, the Germama (Kasam), and then trends round in the direction of the Gulf of Tadjoura. Here the Awash is a copious stream nearly Шаблон:Convert wide and Шаблон:Convert deep, even in the dry season, and during the floods rising Шаблон:Convert above low-water mark, thus inundating the plains for many kilometers along both its banks.Шаблон:Sfn

Файл:Flamants roses du Lac Abbe.JPG
Flamingos at Lake Abbe.

After a winding course of about Шаблон:Convert, the Awash River passes (in its lower reaches) through a series of badds (lagoons) to Lake Abbe (or Abhe Bid) on the border with Djibouti and some Шаблон:Convert from the head of the Gulf of Tadjoura. In this lake the Awash river is lost. This remarkable phenomenon is explained by the position of Lake Abbe in the centre of a saline lacustrine depression several hundred meters below sea level. While most of the other lagoons are highly saline, with thick incrustations of salt round their margins, Lake Abbe remains fresh throughout the year, owing to the great body of water discharged into it by the Awash.Шаблон:Sfn

Another lacustrine region extends from the Shoan heights southwest to the Samburu (Lake Turkana) depression. In this chain of scenic upland lakes – some fresh, some brackish, some completely closed, others connected by short channels – the chief links in their order from north to south are: Zway, communicating southwards with Hara and Lamina, all in the Arsi Zone; then Abijatta with an outlet to a smaller turn to the Baroda and Gamo areas, skirted on the west sides by grassy slopes and wooded ranges from Шаблон:Convert to nearly Шаблон:Convert high; lastly, Lake Chew Bahir (formerly known as Lake Stephanie) which is completely closed and falling to a level of about Шаблон:Convert above sea level.Шаблон:Sfn

To the same system belongs the neighbouring Lake Turkana, which is larger than all the rest put together. This lake receives at its northern end the waters of the Omo, which rises in the Shoan highlands and is a perennial river with many affluents. In its course of some Шаблон:Convert it has a total fall of about Шаблон:Convert, from Шаблон:Convert at its source to c. Шаблон:Convert at lake level, and is consequently a rapid stream, being broken by the Kokobi and other falls, and navigable only for a short distance above its mouth.Шаблон:Sfn

The chief rivers of Somalia, the Shebelle and the Jubba, rise on the southeastern slopes of the Ethiopian escarpment as the Shebelle, the Ganale Doria and the Dawa, and part of their course is through territory belonging to Ethiopia.Шаблон:Sfn

There are numerous hot springs in Ethiopia, such as Sodere.

Geology

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Файл:Erta Ale-Lac de lave (14).jpg
Erta Ale in the Afar Region.

The East African tableland is continued into Ethiopia. A pioneering study of the geology of Ethiopia was W. T. Blanford's work in 1870.Шаблон:Sfn More recent work has focused on the Afar Depression, due to its importance as one of two places on Earth where a mid-ocean ridge can be studied on land (the other is Iceland).

The following formations are represented:

Sedimentary and metamorphic
Igneous
Файл:Nabro and Mallahle Volcanoes-NASA.jpg
False-color topographical relief image of Nabro caldera (top; in Eritrea) next to the Mallahle volcanic caldera, then Mount Sarkali with the smaller Sork Ale caldera in the bottom right – SRTM colored height and shaded relief.[2]

Archaean.– The metamorphic rocks compose the main mass of the tableland, and are exposed in every deep valley in Tigre and along the valley of the Blue Nile. Mica-schists form the prevalent rocks. Hornblende schists also occur and a compact feldspathic rock in the Suris defile. The folia of the schists strike north and south.Шаблон:Sfn

Triassic.– In the region of Adigrat the metamorphic rocks are invariably overlain by white and brown sandstones, unfossiliferous, and attaining a maximum thickness of 300 m. They are overlain by the fossiliferous limestones of the Antalo group. Around Chelga and Adigrat coal-bearing beds occur, which Blanford suggests may be of the same age as the coal-bearing strata of India. The Adigrat Sandstone possibly represents some portion of the Karoo System of South Africa.Шаблон:Sfn

Jurassic.– The fossiliferous Antalo Limestones are generally horizontal, but are in places much disturbed when interstratified with Mekelle Dolerite. The fossils are all characteristic Oolite forms and include species of Hemicidaris, Pholadomya, Ceromya, Trigonia and Alaria.Шаблон:Sfn

Igneous Rocks.– Above a height of Шаблон:Convert the country consists of bedded traps belonging to two distinct and unconformable groups. The lower (Ashangi group) consists of basalts and dolerites often amygdaloidal. Their relation to the Antalo limestones is uncertain, but Blanford considers them to be not later in age than the Oolite. The upper (Magdala group) contains much trachytic rock of considerable thickness, lying perfectly horizontally, and giving rise to a series of terraced ridges characteristic of central Ethiopia. They are interbedded with unfossiliferous sandstones and shales.Шаблон:Sfn

Of more recent date (probably Tertiary) are some igneous rocks, rich in alkalis, occurring in certain localities in southern Ethiopia. Of still more recent date are the basalts and ashes west of Massawa and around Annesley Bay and known as the Aden Volcanic Series. With regard to the older igneous rocks, the enormous amount they have suffered from denudation is a prominent feature. They have been worn into deep and narrow ravines, sometimes to a depth of Шаблон:Convert.Шаблон:Sfn

Climate

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Файл:Köppen climate types of Ethiopia.svg
Köppen climate classification zones of Ethiopia

The climate of Ethiopia and its dependent territories varies greatly. It is temperate on the plateau and hot in the lowlands. The country lies wholly within the tropics, but its nearness to the equator is counterbalanced by the elevation of the land. At Addis Ababa, which ranges from Шаблон:Convert, maximum temperature is Шаблон:Convert and minimum Шаблон:Convert. The weather is usually sunny and dry, but the short (belg) rains occur from February to April and the large (meher) rains from mid-June to mid-September. Over the greater part of Ethiopia as well as the Oromia highlands, the climate is very healthy and temperate. However, in the deep valleys of the Tekezé and Abay, and generally in places below Шаблон:Convert, the conditions are tropical and diseases such as malaria are prevalent. The Somali Region and the Danakil Depression in the Afar Region have a hot, sunny and dry climate producing fully desert or semi-desert conditions. The terrain in the lower basin of the Sobat is hot, swampy and malarious.Шаблон:Sfn

In the uplands, the air is cool and bracing in summer, and in winter very bleak. The mean range of temperature is between Шаблон:Convert. On the higher mountains the climate is alpine in character. The atmosphere on the plateaus is exceedingly clear, so that objects are easily recognizable at great distances. In addition to the variation in climate dependent on elevation, the year may be divided into three seasons. Winter, or the cold season, lasts from October to February. It is followed by a dry hot period, which about the middle of June gives place to the rainy season. The rain is heaviest in the Tekezé basin in July and August.Шаблон:Sfn

In the former provinces of Gojjam and Welega, heavy rains continue till the middle of September. October is occasionally a wet month. There are also spring and winter rains; indeed rain often falls in every month of the year. But the rainy season proper, caused by the southwest monsoon, lasts from June to mid-September, and commencing in the north moves southward. In the region of the headwaters of the Sobat the rains begin earlier and last longer. The rainfall varies from about Шаблон:Convert a year in Tigray and Amhara to over Шаблон:Convert in parts of Oromia.Шаблон:Sfn

The rainy season is of great importance not only to Ethiopia but to the countries of the Nile valley, as the prosperity of the eastern Sudan and Egypt is largely dependent upon the rainfall. A season of light rain may be sufficient for the needs of Ethiopia, but there is little surplus water to find its way to the Nile; and a shortness of rain means a low Nile, as practically all the flood water of that river is derived from the Ethiopian tributaries.Шаблон:Sfn

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Flora and fauna

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Flora

As in a day's journey the traveller may pass from tropical to almost Alpine conditions of climate, so great also is the range of the flora and fauna. In the valleys and lowlands the vegetation is dense, but the general appearance of the plateaus is of a comparatively bare country with trees and bushes thinly scattered over it. The glens and ravines on the hillside are often thickly wooded, and offer a delightful contrast to the open downs.Шаблон:Sfn

These conditions are particularly characteristic of the northern regions; in the south the vegetation on the uplands is more luxuriant. Among the many varieties of trees and plants found are the date palm, mimosa, wild olive, giant sycamores, junipers and laurels, the myrrh and other gum trees (gnarled and stunted, these flourish most on the eastern foothills), a magnificent pine (the Natal yellow pine, which resists the attacks of the white ant), the fig, orange, lime, pomegranate, peach, apricot, banana, and other fruit trees; the grape vine (rare), blackberry, and raspberry; the cotton and indigo plants, and occasionally the sugar cane. There are in the south large forests of valuable timber trees; and the coffee plant is indigenous in the Kaffa country, whence it takes its name.Шаблон:Sfn

Файл:Kniphofia foliosa, Bale NP, Ethiopia 2019.jpg
Kniphofia foliosa, Bale Mountains National Park.

Many kinds of grasses and flowers abound. Large areas are covered by the kosso, a hardy member of the rose family, which grows from Шаблон:Convert high and has abundant pendent red blossoms. The flowers and the leaves of this plant are highly prized for medicinal purposes. The fruit of the hurarina, a tree found almost exclusively in Shoa, yields a black grain highly esteemed as a spice. On the tableland a great variety of cereals and vegetables are cultivated. A fibrous plant, known as the sansevieria, grows in a wild state in the semi-desert regions of the north and south-east.Шаблон:Sfn

Fauna

In addition to the domestic animals enumerated below the fauna is very varied. Elephant can be found in certain low-lying districts, especially in the Sobat valley. The hippopotamus and crocodile inhabit the larger rivers flowing west, but are not found in the Hawash, in which, however, otters of large size are plentiful. Lions abound in the low countries. In central Ethiopia the lion is no longer found except occasionally in the river valleys.Шаблон:Sfn

Leopards, both spotted and black, are numerous and often of great size; hyenas are found everywhere and are hardy and fierce; the lynx, African wolf, wild dog and jackal are also common. Boars and badgers are more rarely seen. The giraffe is found in the western districts, the zebra and wild ass frequent the lower plateaus and the rocky hills of the north. There are large herds of buffalo and antelope, and gazelles of many varieties and in great numbers are met with in most parts of the country.Шаблон:Sfn

Among the varieties are the greater and lesser kudu (both rather rare); the duiker, gemsbok, hartebeest, gerenuk (the most common—it has long thin legs and a camel-like neck); klipspringer, found on the high plateaus as well as in the lower districts; and the dik-dik, the smallest of the antelopes, its weight rarely exceeding Шаблон:Convert, common in the low countries and the foothills. The African civet is found in many parts of Ethiopia, but chiefly in the Galla regions. Squirrels and hares are numerous, as are several kinds of monkeys, notably the guereza, gelada, guenon and dog-faced baboon. They range from the tropical lowlands to heights of Шаблон:Convert.

Файл:Ground Hornbill, Omo Valley (13124016413).jpg
Abyssinian ground hornbills near the Omo river valley.

Numerous eagles, vultures, hawks, bustards and other birds of prey live in Ethiopia, as well as partridges, guineafowl, sandgrouse, curlews, woodcock, snipe, pigeons, thrushes and swallows are very plentiful. A fine variety of ostrich is commonly found. Among the birds prized for their plumage are the marabou, crane, heron, blackbird, parrot and jays of extraordinary brilliance.Шаблон:Sfn

Among insects the most numerous and useful is the bee, honey everywhere constituting an important part of the food of the inhabitants. Of an opposite class is the locust. There are thousands of varieties of butterflies and other insects. Snakes are not numerous, but several species are venomous.Шаблон:Sfn

Natural resources and land use

Ethiopia has small reserves of gold, platinum, copper, potash, and natural gas.[3] It has extensive hydropower potential.[3]

Of the total land area, about 20 percent is under cultivation, although the amount of potentially arable land is larger.[3] Only about 10 to 15 percent of the land area is presently covered by forest as a result of rapid deforestation during the last 30 years.[3] Of the remainder, a large portion is used as pasturage. Some land is too rugged, dry, or infertile for agriculture or any other use.[3]

Environmental issues

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Disputed border

Eritrea

Шаблон:Update The border between Ethiopia and Eritrea has never been precisely demarcated.[3] Between 1998 and 2000, the two countries fought a war over the issue, which involves quite small enclaves along the northern segment of their border, including the tiny village of Badme and the enclave of the Irob people.[3] An international boundary commission delimited the border in 2002.[3]

Although both nations agreed to accept its decision, Ethiopia has refused to accept the commission's findings in full, much to the consternation of the Eritrean government.[3]

Somalia

The central section of Ethiopia's border with Somalia also has never been fully demarcated, and is only provisional. [3] Prior to 1950, the border between Somalia and Ethiopia was characterized by the 1908 Convention Line or Feerfeer-Dharkayn Geenyo Line.[4]

Questions remain about the precise location of small parcels along the border with Sudan as well.[3]

Statistics

Location
Eastern Africa, west of Somalia
Geographic coordinates
Шаблон:Coord
Map references
Africa
Area
  • Total: 1,127,127 km²
  • Land: 1,119,683 km²
  • Water: 7,444 km²
Land boundaries
Coastline
0 km (landlocked):
Climate
Tropical monsoon with wide topographic-induced variation
Terrain
High plateau with central mountain range divided by Great Rift Valley
Elevation extremes
Natural resources
Small reserves of gold, platinum, copper, potash, natural gas, hydropower
Land use
  • Arable land: 15.35%
  • Permanent crops: 1.14%
  • Other: 83.51% (2012 est.)
Irrigated land
2,896 km² (2003)
Total renewable water resources
122 km3 (2011)
Freshwater withdrawal (domestic/industrial/agricultural)
  • total: 5.56 km3/yr (13%/1%/86%)
  • per capita: 80.5 m3/yr (2005)
Natural hazards
Geologically active Great Rift Valley susceptible to earthquakes, volcanic eruptions; frequent droughts
Environment – current issues
Deforestation; overgrazing; soil erosion; desertification; water shortages in some areas from water-intensive farming and poor management
Environment – international agreements
Geography – note
Landlocked – entire coastline along the Red Sea was lost with the de jure independence of Eritrea on 24 May 1993

See also

References

  1. Шаблон:Cite web
  2. Шаблон:Cite web
  3. 3,00 3,01 3,02 3,03 3,04 3,05 3,06 3,07 3,08 3,09 3,10 Country study – Library of Congress (PDF)
  4. Area Handbook for Somalia - Volume 550 , Irving Kaplan · 1977 , PAGE 22

External links

Шаблон:Commons

Шаблон:Ethiopia topics Шаблон:Geography of Africa Шаблон:Africa topic