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Tamanrasset River

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The Tamanrasset River is an enormous palaeoriver believed to have flowed through West Africa as recently as 5000 years ago during the African humid period . The Tamanrasset River basin is thought to have been comparable with the present-day Ganges-Brahmaputra river basin in Asia.

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45-525: Western side: Eastern side: The Tamanrasset is thought to have flowed across the Sahara in ancient times from sources in the southern Atlas Mountains and Hoggar highlands in what is now Algeria . It is thought the river fed into the Cap Timiris Canyon, located off the coast of Mauritania ; the canyon is located in waters three kilometres deep and is 2.5km wide in places. The presence of

90-920: A mountain range in the Maghreb in North Africa . It separates the Sahara Desert from the Mediterranean Sea and the Atlantic Ocean ; the name "Atlantic" is derived from the mountain range, which stretches around 2,500 km (1,600 mi) through Morocco , Algeria and Tunisia . The range's highest peak is Toubkal , which is in central Morocco, with an elevation of 4,167 metres (13,671 ft). The Atlas Mountains are primarily inhabited by Berber populations. The terms for 'mountain' are Adrar and adras in some Berber languages , and these terms are believed to be cognates of

135-536: A widespread extension of the Earth's crust that rifted and separated the continents mentioned above. This extension was responsible for the formation of many thick intracontinental sedimentary basins including the present Atlas. Most of the rocks forming the surface of the present High Atlas were deposited under the ocean at that time. In the Paleogene and Neogene Periods (~66 million to ~1.8 million years ago),

180-767: Is also a recognized geographical division used by the United States Geological Survey . All entities within the region apart from the District of Columbia and West Virginia border the Atlantic Ocean. As of 2010, the South Atlantic states had a combined population of 61,774,970. The South Atlantic region covers 292,589 square miles (757,800 km ). With the exception of West Virginia, the region has seen rapid population growth and economic development in recent decades. As of 2023,

225-672: Is ranked the sixth-best in the nation. The Southeastern United States is a large region of the country that includes a core of states that reaches north to Maryland and West Virginia , bordering the Ohio River and Mason–Dixon line , and stretches west to Arkansas and Louisiana . Unlike the Northeast, there is no official U.S. government definition for the Southeast, and it is defined variably among agencies and organizations. Its unique cultural and historic heritage includes

270-414: Is sometimes considered a distinct cultural area due to its large concentration of Native American tribes. New England is a subregion of the northeastern U.S. that is bounded by the Atlantic Ocean , Canada , and the state of New York . It includes six states: Maine , New Hampshire , Vermont , Massachusetts , Rhode Island , and Connecticut . In one of the earliest British colonial settlements in

315-724: The Alleghenian orogeny . These mountains were formed when Africa and America collided and were once a chain rivaling today's Himalayas . Today, the remains of this chain can be seen in the Fall Line region in the Eastern United States . Some remnants can also be found in the later formed Appalachians in North America. A second phase took place during the Mesozoic Era (before ~66 My). It consisted of

360-822: The American Revolutionary War , and later where the U.S. Constitution was drafted and ratified at Independence Hall in Philadelphia in 1789. As of 2023, the Mid-Atlantic region is home to four of the top twenty-five universities in the nation, according to 2022-23 U.S. News & World Report rankings: Princeton University in Princeton, New Jersey, Cornell University in Ithaca, New York, Columbia University in New York, New York, and

405-575: The Atlantic Ocean in the southwest of Morocco toward the northeast to the heights of Ouarzazate and further east to the city of Tafilalt (altogether a distance of approximately 500 kilometres or 300 miles). In the south it borders the Sahara . The easternmost point of the anti-Atlas is the Jbel Saghro range and its northern boundary is flanked by sections of the High Atlas range . It includes

450-768: The Atlantic Provinces of Canada and the Atlantic seaboard of the United States south to North Carolina . The Saint Lawrence Lowlands area includes parts of Southern Ontario , upstate New York , much of the Saint Lawrence River area, and the Susquehanna Valley . The Great Lakes-Riverine area includes the remaining inland areas of the Northeast, which were home to Central Algonquian and Siouan speakers. The Great Lakes region

495-896: The Mediterranean coast and joins with the Saharan Atlas in Eastern Algeria and Tunisia. The highest summit of the Tell Atlas is the 2,308 m (7,572 ft) Lalla Khadidja in the Djurdjura range of Kabylia . The western end of the Tell Atlas merges with the Middle Atlas range in Morocco. The area immediately to the south of the Tell Atlas is the high plateau of the Hautes Plaines , with lakes in

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540-654: The New World , Pilgrims from England first settled in New England in 1620 at Plymouth Colony in and around present-day Plymouth, Massachusetts . In the late 18th century, the New England colonies were among the first North American British colonies to support an escalation in the American Revolution against Britain , launching the Boston Tea Party on December 16, 1773, and later firing

585-704: The U.S. Census Bureau , the Northeastern United States coomprises nine states, including (north to south): Maine , New Hampshire , Vermont , Massachusetts , Rhode Island , Connecticut , New Jersey , New York , and Pennsylvania . The present-day Northeast is significantly smaller than the Northeastern Woodlands cultural area. The pre-Columbian Northeast had three major areas: the Coastal area, Saint Lawrence Lowlands, and Great Lakes-Riverine zones. The Coastal area includes

630-619: The University of Pennsylvania in Philadelphia, Pennsylvania. The East North Central area, which includes Illinois , Indiana , Michigan , Ohio , and Wisconsin , can also be classified as a subregion of the Northeastern United States, as these states are in the Great Lakes-Riverine area. As one of two subregional divisions used to categorize the modern Midwest , the East North Central region closely matches

675-584: The toponym Atlas . The mountains are home to a number of animals and plants which are mostly found within Africa but some of which can be found in Europe. Many of these species are endangered and a few are already extinct . The weather is generally cool but summers are sunny, and the average temperature there is 25 °C. The Atlas Mountains have earned a reputation as a trekkers’ den, attracting adventurers year-round. The basement rock of most of Africa

720-872: The Atlas mountain range. It covers parts of Algeria and Tunisia . The Aurès natural region is named after the range. Flora in the mountains include the Atlas cedar , evergreen oak and many semi-evergreen oaks such as the Algerian oak . Animals that live in the area include the Barbary macaque (misnamed as the Barbary ape), Barbary leopard , Barbary stag , Barbary sheep , Atlas Mountain badger , Cuvier's gazelle , North African boar , striped hyena , Red fox , northern bald ibis , Algerian nuthatch , dipper , and Atlas mountain viper . Many animals used to inhabit

765-474: The Atlas mountains such as the Atlas bear , North African elephant , North African aurochs , bubal hartebeest and Atlas wild ass , but these subspecies are all extinct. Barbary lions are currently extinct in the wild, but descendants exist in captivity. Eastern United States The Eastern United States , often abbreviated as simply the East , is a macroregion of the United States located to

810-645: The Djebel Siroua, a massif of volcanic origin with the highest summit of the range at 3,304 m. The Jebel Bani is a much lower range running along the southern side of the Anti Atlas. The High Atlas in central Morocco rises in the west at the Atlantic coast and stretches in an eastern direction to the Moroccan-Algerian border. It has several peaks over 4,000 m (13,000 ft), including

855-548: The Earth’s rotation . The palaeoriver was discovered using a Japanese orbital satellite system called Phased Array type L-band Synthetic Aperture Radar (PALSAR). Using microwave sensing, PALSAR can see below Saharan sands and detect the fossil water still present. The Tamanrasset has been noted as a possible location for an ancient Saharan civilization based solely on comparisons with similar contemporary river systems and their associated civilizations. The existence and location of

900-624: The High Atlas, crossing Algeria from the Moroccan border and into Tunisia. The Aures Mountains are often presented as being the easternmost part of the Saharan Atlas. Though not as high as the High Atlas, they reach similar altitudes as the Tell Atlas range that runs to the north of them and closer to the coast. The highest peak in the range, outside of the Aures Mountains, is the 2,236 m (7,336 ft) high Djebel Aissa. They mark

945-558: The Middle Atlantic is a subregion of the northeastern U.S. that includes three states: New Jersey , New York , and Pennsylvania . The Middle Atlantic region includes New York City , the largest city in the U.S. and a global center of finance and culture, and Philadelphia , the nation's sixth-largest city and first capital, where the Declaration of Independence was signed at Independence Hall in 1776, formally launching

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990-623: The South Atlantic region is home to three of the top ten universities in the nation, according to 2022-23 U.S. News & World Report rankings: Johns Hopkins University in Baltimore, Maryland, Georgetown University in Washington, D.C., and Duke University in Durham, North Carolina , which is ranked the tenth-best in the nation. The East South Central region constitutes one of the nine U.S. Census Bureau divisions . Four states make up

1035-491: The Tamanrasset River was only confirmed by scientists in 2015, although an expedition looking for oil found the Cap Timiris Canyon in 2003 which was likely formed by the flow of the sediment-laden freshwater of this river system. Currently no evidence exists of any former civilization or agricultural community which dates to the time in which the river was present. Atlas Mountains The Atlas Mountains are

1080-676: The United States is one of the nine Census Bureau Divisions of the country. This region corresponds to the Southern states/areas that were geographically part of the Thirteen Colonies , with the addition of Florida . It includes eight states and one federal district: Delaware , Florida , Georgia , Maryland , North Carolina , South Carolina , Virginia , West Virginia and the District of Columbia . The South Atlantic

1125-690: The United States to be transformed by the Industrial Revolution . As of 2023, New England is home to two of the top ten universities in the nation, according to 2022-23 U.S. News & World Report rankings, Harvard University in Cambridge, Massachusetts (tied for third), and Massachusetts Institute of Technology in Cambridge, Massachusetts (tied for third). According to the United States Census Bureau ,

1170-620: The area are Ouarzazate , Tahannaout , Amizmiz , Imlil , Tin Mal and Ijoukak . The Middle Atlas is completely in Morocco and is the northernmost of its three main Atlas ranges. The range lies north of the High Atlas, separated by the Moulouya and Oum Er-Rbia rivers, and south of the Rif mountains, separated by the Sebou River . To the west are the main coastal plains of Morocco with many of

1215-728: The area of the Northwest Territory , excluding a portion of Minnesota . The East North Central states form a large part of the Great Lakes region, although the latter also includes Minnesota, New York , Pennsylvania and the Canadian province of Ontario . Culturally, the East North Central region of the U.S. has been historically influenced by the British and the French; Anglo-American culture permeated states covering

1260-665: The case of the Africa-Europe collision, it is clear that tectonic convergence is partially responsible for the formation of the High Atlas , as well as for the closure of the Strait of Gibraltar and the formation of the Alps and the Pyrenees . However, there is a lack of evidence for the nature of the subduction in the Atlas region, or for the thickening of the Earth's crust generally associated with continental collisions. One of

1305-471: The core of Old Dixie , one of the nine moral regions identified by James Patterson and Peter Kim in their acclaimed 1991 geopolitical best-seller, The Day America Told The Truth . Politically and culturally, the East South Central is more conservative than the South Atlantic; Mississippi, Alabama, Kentucky, and Tennessee's governments have been described during 2012 to 2023 as some of

1350-534: The division: Kentucky , Tennessee , Mississippi and Alabama . Historically, the area has been colonized and influenced by the French , Spanish , British , early US, and Confederate governments. Distinct among these states, Alabama's French culture has been preserved through the Alabama Creoles , and Kentucky's French culture can be observed throughout Louisville. The East South Central states form

1395-545: The east of the Mississippi River . It includes 17–26 states and Washington, D.C. , the national capital. As of 2011, the Eastern United States had an estimated population exceeding 179 million, representing the majority (over 58 percent) of the total U.S. population. The three most populous cities in the Eastern United States are New York City , Chicago , and Philadelphia . According to

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1440-408: The first shots of the American Revolutionary War in the Battles of Lexington and Concord on April 19, 1775. New England produced the first examples of American literature and philosophy and was home to the beginnings of free and compulsory public education. In the 19th century, the region played a prominent role in the movement to abolish slavery in the United States . It was the first region of

1485-745: The following aspects: These aspects, among other things, led to "the South" developing distinctive customs, literature, musical styles, and varied cuisines that have profoundly shaped traditional American culture. The shift from a mainly rural society to more cities and urbanized metropolitan areas picked up speed following World War II in the 1940s. Since the late 20th century, certain Southeastern states and areas have seen great economic growth. This growth has led to many migrants moving to Southeastern states. In 2020, Fortune 500 companies headquartered in southeastern states included: Virginia with 22, Georgia with 18, Florida with 18, North Carolina with 13, and Tennessee with 10. The South Atlantic region of

1530-419: The highest summit in North Africa, Toubkal (4,167 m or 13,671 ft), and further east Ighil m'Goun (4,071 m or 13,356 ft), the second major summit of the range. At the Atlantic and to the southwest, the range drops abruptly and makes a transition to the coast and the Anti-Atlas range. To the north, in the direction of Marrakesh , the range descends less abruptly. On the heights of Ouarzazate

1575-418: The largest metropolitan statistical area, followed by Detroit , and Minneapolis–Saint Paul . Sault Ste. Marie, Michigan is the oldest city in the region, founded by French missionaries and explorers in 1668. As of 2023, the East North Central States are home to one of the top ten universities in the nation, according to 2022-23 U.S. News & World Report rankings: the University of Chicago , which

1620-451: The major cities and, to the east, the high barren plateau that lies between the Saharan and Tell Atlas. The high point of the range is the jbel Bou Naceur (3340 m). The Middle Atlas experiences more rain than the ranges to the south, making it an important water catchment for the coastal plains and important for biodiversity. It is home to the majority of the world's population of Barbary macaque . The Saharan Atlas of Algeria runs east of

1665-407: The massif is cut through by the Draa Valley which opens southward. It is mainly inhabited by Berber people, who live in small villages and cultivate the high plains of the Ourika Valley . Near Barrage Cavagnac there is a hydroelectric dam that has created the artificial lake Lalla Takerkoust . The lake serves also as a source for fish for the local fishermen. The largest villages and towns of

1710-429: The most conservative. Religiously, conservative Evangelical Protestantism dominates the East South Central region as a central part of the Bible Belt . As of 2020, the East South Central states had a combined population of 19,430,030. The East South Central region covers 183,401 square miles of land. Within the region, Tennessee is the largest state by population, though Alabama is the largest by land area; Tennessee

1755-623: The most striking features of the Atlas to geologists is the relative small amount of crustal thickening and tectonic shortening despite the important altitude of the mountain range. Recent studies suggest that deep processes rooted in the Earth's mantle may have contributed to the uplift of the High and Middle Atlas. The Atlas are rich in natural resources . There are deposits of iron ore , lead ore , copper , silver , mercury , rock salt , phosphate , marble , anthracite coal and natural gas among other resources. The range can be divided into four general regions: The Anti-Atlas extends from

1800-407: The mountain chains that today constitute the Atlas were uplifted, as the land masses of Europe and Africa collided at the southern end of the Iberian Peninsula . Such convergent tectonic boundaries occur where two plates slide towards each other forming a subduction zone (if one plate moves underneath the other), and/or a continental collision (when the two plates contain continental crust ). In

1845-427: The northern edge of the Sahara Desert . The mountains see some rainfall and are better suited to agriculture than the plateau region to the north. Today, most of the population of the region are Berbers ( Imazighen ). The Tell Atlas is a mountain chain over 1,500 kilometres (900 mi) in length, belonging to the Atlas mountain ranges and stretching from Eastern Morocco to Tunisia, and through Algeria. It parallels

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1890-465: The region following the westward expansion of the United States . Religiously, the East North Central states have been and remain predominantly affiliated with Christianity . Altogether, the five states are majority Catholic , non- and inter-denominational , Methodist , Lutheran , and Baptist . The largest non-Christian religion has been Islam . Chicago is the largest city in the region, followed by Columbus, Ohio and Indianapolis . Chicago has

1935-403: The river is thought to have had wide-ranging implications for human migration from Central Africa to the Middle East, Europe, and Asia. Previously, the inhospitable Sahara desert was believed to have made a western route for migrating to Europe unviable. Researchers believe that the ancient river became active during the African Humid Period , climate oscillations caused by the precession of

1980-405: The wet season and salt flats in the dry. The eastern half of the Tell Atlas has the most humid climate of North Africa, with annual precipitation reaching well above 1,000 mm (39 in), and sometimes over 1,500 mm (59 in) like in the Collo Peninsula or near Ain Draham . An important amount of snow falls on the summits in winter. The Aurès Mountains are the easternmost portion of

2025-521: Was formed during the Precambrian supereon and is much older than the Atlas Mountains lying on the continent. The Atlas was formed during three subsequent phases of Earth's geology. The first tectonic deformation phase involves only the Anti-Atlas , which was formed in the Paleozoic Era (~300 million years ago) as the result of continental collisions . North America , Europe and Africa were connected millions of years ago. The Anti-Atlas Mountains are believed to have originally been formed as part of

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