1.
Cameroon line
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The Cameroon line is a 1,600 km chain of volcanoes. The islands, which span the equator, have tropical climates and are home to many unique plant, the mainland mountain regions are much cooler than the surrounding lowlands, and also contain unique and ecologically important environments. The Cameroon volcanic line is unusual in extending through both the ocean and the continental crust. Various hypotheses have advanced by different geologists to explain the line. In the Gulf of Guinea, the Cameroon line consists of six offshore volcanic swells that have formed islands or seamounts, from the southwest to the northeast the island groups are Pagalu, São Tomé, Príncipe and Bioko. Two large seamounts lie between São Tomé and Príncipe, and between Principe and Bioko, on the mainland, the line starts with Mount Cameroon and extends northeast in a range known as the Western High Plateau, home to the Cameroonian Highlands forests. Volcanic swells further inland are Manengouba, Bamboutu and the Oku Massif, east of Oku there are further volcanic mountains in the Ngaoundere Plateau, some of which appear to have similar origins. The southernmost island in the chain is Annobón, also known as Pagalu and it is an extinct volcano that rises from deep water to 598 m above sea level. The average temperature is 26.1 °C, with seasonal variation. Most rain falls from November to May, with annual precipitation averaging 1,196 mm - less than on the mainland, Annobón has lush valleys and steep mountains, covered with rich woods and luxuriant vegetation. The island belongs to Equatorial Guinea, the small population lives in one community, practicing some agriculture but mainly living by fishing. São Tomé Island is 854 km2 in area, lying almost on the equator. The entire island is a shield volcano which rises from the floor of the Atlantic Ocean, over 3,000 m below sea level. The oldest rock on Sao Tome is 13 million years old, most of the lava erupted on São Tomé over the last million years has been basalt. The youngest dated rock on the island is about 100,000 years old, due to the prevailing southwesterly winds, there is great variability in rainfall. In the rain shadow to the northeast of Sao Tome the vegetation is dry savannah, by contrast, the lush south and west of the island receive about 6 m of rain, mostly falling in March and April. The climate is hot and humid with the season from October to May. The higher slopes of the island are forested and form part of the Obo National Park, São Tomé has never been connected to Africa, and therefore has many unique plants and birds
2.
Geographic coordinate system
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A geographic coordinate system is a coordinate system used in geography that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are chosen such that one of the numbers represents a vertical position. A common choice of coordinates is latitude, longitude and elevation, to specify a location on a two-dimensional map requires a map projection. The invention of a coordinate system is generally credited to Eratosthenes of Cyrene. Ptolemy credited him with the adoption of longitude and latitude. Ptolemys 2nd-century Geography used the prime meridian but measured latitude from the equator instead. Mathematical cartography resumed in Europe following Maximus Planudes recovery of Ptolemys text a little before 1300, in 1884, the United States hosted the International Meridian Conference, attended by representatives from twenty-five nations. Twenty-two of them agreed to adopt the longitude of the Royal Observatory in Greenwich, the Dominican Republic voted against the motion, while France and Brazil abstained. France adopted Greenwich Mean Time in place of local determinations by the Paris Observatory in 1911, the latitude of a point on Earths surface is the angle between the equatorial plane and the straight line that passes through that point and through the center of the Earth. Lines joining points of the same latitude trace circles on the surface of Earth called parallels, as they are parallel to the equator, the north pole is 90° N, the south pole is 90° S. The 0° parallel of latitude is designated the equator, the plane of all geographic coordinate systems. The equator divides the globe into Northern and Southern Hemispheres, the longitude of a point on Earths surface is the angle east or west of a reference meridian to another meridian that passes through that point. All meridians are halves of great ellipses, which converge at the north and south poles, the prime meridian determines the proper Eastern and Western Hemispheres, although maps often divide these hemispheres further west in order to keep the Old World on a single side. The antipodal meridian of Greenwich is both 180°W and 180°E, the combination of these two components specifies the position of any location on the surface of Earth, without consideration of altitude or depth. The grid formed by lines of latitude and longitude is known as a graticule, the origin/zero point of this system is located in the Gulf of Guinea about 625 km south of Tema, Ghana. To completely specify a location of a feature on, in, or above Earth. Earth is not a sphere, but a shape approximating a biaxial ellipsoid. It is nearly spherical, but has an equatorial bulge making the radius at the equator about 0. 3% larger than the radius measured through the poles, the shorter axis approximately coincides with the axis of rotation
3.
Niger River
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The Niger River is the principal river of western Africa, extending about 4,180 km. Its drainage basin is 2,117,700 km2 in area and its source is in the Guinea Highlands in southeastern Guinea. The Niger is the third-longest river in Africa, exceeded only by the Nile and its main tributary is the Benue River. The Scottish explorer Mungo Park was the first Westerner known to have travelled to the portion of the Niger River. The earliest use of the name Niger for the river is by Leo Africanus in his Della descrittione dell’Africa et delle cose notabili che iui sono published in Italian in 1550, the name may come from Berber phrase ger-n-ger meaning river of rivers. As Timbuktu was the end of the principal Trans-Saharan trade route to the western Mediterranean. When European colonial powers began to send ships along the West coast of Africa in the 16th and 17th centuries, the Niger Delta, pouring into the Atlantic through mangrove swamps and thousands of distributaries along more than 160 kilometres, was thought to be no more than coastal wetlands. The Niger River is a clear river, carrying only a tenth as much sediment as the Nile because the Nigers headwaters lie in ancient rocks that provide little silt. Like the Nile, the Niger floods yearly, this begins in September, peaks in November, an unusual feature of the river is the Inner Niger Delta, which forms where its gradient suddenly decreases. The result is a region of braided streams, marshes, and lakes the size of Belgium, the river loses nearly two-thirds of its potential flow in the Inner Delta between Ségou and Timbuktu to seepage and evaporation. All the water from the Bani River, which flows into the Delta at Mopti, the average loss is estimated at 31 km3/year, but varies considerably between years. The river is joined by various tributaries, but also loses more water to evaporation. The quantity of water entering Nigeria measured in Yola was estimated at 25 km3/year before the 1980s, the most important tributary of the Niger in Nigeria is the Benue River which merges with the river at Lokoja in Nigeria. The Niger takes one of the most unusual routes of any major river and this strange geography apparently came about because the Niger River is two ancient rivers joined together. Over time upstream erosion by the lower Niger resulted in capture of the upper Niger by the lower Niger. The northern part of the river, known as the Niger bend, is an important area because it is the major river and this made it the focal point of trade across the western Sahara, and the centre of the Sahelian kingdoms of Mali and Gao. The surrounding Niger River Basin is one of the distinct physiographic sections of the Sudan province, the origin of the rivers name remains unclear. What is clear is that Niger was an appellation applied in the Mediterranean world from at least the Classical era, when knowledge of the area by Europeans was slightly better than fable
4.
Atlantic Ocean
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The Atlantic Ocean is the second largest of the worlds oceans with a total area of about 106,460,000 square kilometres. It covers approximately 20 percent of the Earths surface and about 29 percent of its surface area. It separates the Old World from the New World, the Atlantic Ocean occupies an elongated, S-shaped basin extending longitudinally between Eurasia and Africa to the east, and the Americas to the west. The Equatorial Counter Current subdivides it into the North Atlantic Ocean, in contrast, the term Atlantic originally referred specifically to the Atlas Mountains in Morocco and the sea off the Strait of Gibraltar and the North African coast. The Greek word thalassa has been reused by scientists for the huge Panthalassa ocean that surrounded the supercontinent Pangaea hundreds of years ago. The term Aethiopian Ocean, derived from Ancient Ethiopia, was applied to the Southern Atlantic as late as the mid-19th century, many Irish or British people refer to the United States and Canada as across the pond, and vice versa. The Black Atlantic refers to the role of ocean in shaping black peoples history. Irish migration to the US is meant when the term The Green Atlantic is used, the term Red Atlantic has been used in reference to the Marxian concept of an Atlantic working class, as well as to the Atlantic experience of indigenous Americans. Correspondingly, the extent and number of oceans and seas varies, the Atlantic Ocean is bounded on the west by North and South America. It connects to the Arctic Ocean through the Denmark Strait, Greenland Sea, Norwegian Sea, to the east, the boundaries of the ocean proper are Europe, the Strait of Gibraltar and Africa. In the southeast, the Atlantic merges into the Indian Ocean, the 20° East meridian, running south from Cape Agulhas to Antarctica defines its border. In the 1953 definition it extends south to Antarctica, while in later maps it is bounded at the 60° parallel by the Southern Ocean, the Atlantic has irregular coasts indented by numerous bays, gulfs, and seas. Including these marginal seas the coast line of the Atlantic measures 111,866 km compared to 135,663 km for the Pacific. Including its marginal seas, the Atlantic covers an area of 106,460,000 km2 or 23. 5% of the ocean and has a volume of 310,410,900 km3 or 23. 3%. Excluding its marginal seas, the Atlantic covers 81,760,000 km2 and has a volume of 305,811,900 km3, the North Atlantic covers 41,490,000 km2 and the South Atlantic 40,270,000 km2. The average depth is 3,646 m and the maximum depth, the bathymetry of the Atlantic is dominated by a submarine mountain range called the Mid-Atlantic Ridge. It runs from 87°N or 300 km south of the North Pole to the subantarctic Bouvet Island at 42°S, the MAR divides the Atlantic longitudinally into two halves, in each of which a series of basins are delimited by secondary, transverse ridges. The MAR reaches above 2000 m along most of its length, the MAR is a barrier for bottom water, but at these two transform faults deep water currents can pass from one side to the other
5.
Drainage basin
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A drainage basin or catchment area is any area of land where precipitation collects and drains off into a common outlet, such as into a river, bay, or other body of water. Drainage basins connect into other drainage basins at elevations in a hierarchical pattern, with smaller sub-drainage basins. Other terms used to describe drainage basins are catchment, catchment basin, drainage area, river basin and water basin. In closed drainage basins the water converges to a point inside the basin, known as a sink, which may be a permanent lake. The drainage basin acts as a funnel by collecting all the water within the covered by the basin. Each drainage basin is separated topographically from adjacent basins by a perimeter, drainage basins are similar but not identical to hydrologic units, which are drainage areas delineated so as to nest into a multi-level hierarchical drainage system. Hydrologic units are defined to allow multiple inlets, outlets, or sinks, in a strict sense, all drainage basins are hydrologic units but not all hydrologic units are drainage basins. Drainage basins of the oceans and seas of the world. Grey areas are endorheic basins that do not drain to the oceans, the following is a list of the major ocean basins, About 48. 7% of the worlds land drains to the Atlantic Ocean. The two major mediterranean seas of the world also flow to the Atlantic, The Caribbean Sea and Gulf of Mexico basin includes most of the U. S. The Mediterranean Sea basin includes much of North Africa, east-central Africa, Southern, Central, and Eastern Europe, Turkey, and the areas of Israel, Lebanon. Just over 13% of the land in the world drains to the Pacific Ocean, the Indian Oceans drainage basin also comprises about 13% of Earths land. It drains the eastern coast of Africa, the coasts of the Red Sea and the Persian Gulf, the Indian subcontinent, Burma, antarctica comprises approximately eight percent of the Earths land. The five largest river basins, from largest to smallest, are the basins of the Amazon, the Río de la Plata, the Congo, the Nile, and the Mississippi. The three rivers that drain the most water, from most to least, are the Amazon, Ganga, endorheic drainage basins are inland basins that do not drain to an ocean. Around 18% of all land drains to endorheic lakes or seas or sinks, the largest of these consists of much of the interior of Asia, which drains into the Caspian Sea, the Aral Sea, and numerous smaller lakes. Some of these, such as the Great Basin, are not single drainage basins but collections of separate, in endorheic bodies of standing water where evaporation is the primary means of water loss, the water is typically more saline than the oceans. An extreme example of this is the Dead Sea, drainage basins have been historically important for determining territorial boundaries, particularly in regions where trade by water has been important
6.
Liberia
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Liberia /laɪˈbɪəriə/, officially the Republic of Liberia, is a country on the West African coast. It is bordered by Sierra Leone to its west, Guinea to its north and it covers an area of 111,369 square kilometres and has a population of 4,503,000 people. English is the language and over 20 indigenous languages are spoken. The countrys capital and largest city is Monrovia, forests on the coastline are composed mostly of salt-tolerant mangrove trees, while the more sparsely populated inland has forests opening onto a plateau of drier grasslands. The climate is equatorial, with significant rainfall during the May–October rainy season, Liberia possesses about forty percent of the remaining Upper Guinean rainforest. It was an important producer of rubber in the early 20th century, the Republic of Liberia began as a settlement of the American Colonization Society, who believed African Americans would face better chances for freedom in Africa than in the United States. The country declared its independence on July 26,1847, the U. S. did not recognize Liberias independence until during the American Civil War on February 5,1862. The African American settlers carried their culture with them to Liberia, Liberia maintained and kept its independence during the European colonial era. In addition, President William Tubman encouraged economic changes, internationally, Liberia was a founding member of the League of Nations, United Nations and the Organisation of African Unity. Five years of rule by the Peoples Redemption Council and five years of civilian rule by the National Democratic Party of Liberia were followed by the First. These resulted in the deaths and displacement of more than half a million people, a peace agreement in 2003 led to democratic elections in 2005. Recovery proceeds but about 85% of the population live below the poverty line. The Pepper Coast, also known as the Grain Coast, has been inhabited by peoples of Africa at least as far back as the 12th century. Mende-speaking people expanded westward from the Sudan, forcing many smaller ethnic groups southward toward the Atlantic Ocean, the Dei, Bassa, Kru, Gola and Kissi were some of the earliest documented peoples in the area. This influx was compounded by the decline of the Western Sudanic Mali Empire in 1375, additionally, as inland regions underwent desertification, inhabitants moved to the wetter coast. These new inhabitants brought skills such as spinning, cloth weaving, iron smelting, rice and sorghum cultivation. Shortly after the Mane conquered the region, the Vai people of the former Mali Empire immigrated into the Grand Cape Mount County region, the ethnic Kru opposed the influx of Vai, forming an alliance with the Mane to stop further influx of Vai. People along the coast built canoes and traded with other West Africans from Cap-Vert to the Gold Coast, arab traders entered the region from the north, and a long-established slave trade took captives to north and east Africa
7.
Ivory Coast
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Ivory Coast or Côte dIvoire, officially the Republic of Côte dIvoire, is a country located in West Africa. Ivory Coasts political capital is Yamoussoukro, and its economic capital and its bordering countries are Guinea and Liberia in the west, Burkina Faso and Mali in the north, and Ghana in the east. The Gulf of Guinea is located south of Ivory Coast, prior to its colonization by Europeans, Ivory Coast was home to several states, including Gyaaman, the Kong Empire, and Baoulé. Two Anyi kingdoms, Indénié and Sanwi, attempted to retain their identity through the French colonial period. Ivory Coast became a protectorate of France in 1843–1844 and was formed into a French colony in 1893 amid the European scramble for Africa. Ivory Coast achieved independence in 1960, led by Félix Houphouët-Boigny, the country maintained close political and economic association with its West African neighbors while at the same time maintaining close ties to the West, especially France. Since the end of Houphouët-Boignys rule in 1993, Ivory Coast has experienced one coup détat, in 1999, the first took place between 2002 and 2007 and the second during 2010-2011. As a result, in 2000, the adopted a new Constitution. Ivory Coast is a republic with an executive power invested in its President. Through the production of coffee and cocoa, the country was a powerhouse in West Africa during the 1960s and 1970s. Ivory Coast went through a crisis in the 1980s, contributing to a period of political and social turmoil. Changing into the 21st-century Ivorian economy is largely market-based and still heavily on agriculture. The official language is French, with indigenous languages also widely used, including Baoulé, Dioula, Dan, Anyin. In total there are around 78 languages spoken in Ivory Coast, popular religions include Islam, Christianity, and various indigenous religions. Originally, Portuguese and French merchant-explorers in the 15th and 16th centuries divided the west coast of Africa, very roughly, there was also a Pepper Coast also known as the Grain Coast, a Gold Coast, and a Slave Coast. Like those, the name Ivory Coast reflected the major trade occurred on that particular stretch of the coast. One can find the name Cote de Dents regularly used in older works and it was used in Ducketts Dictionnaire and by Nicolas Villault de Bellefond, for examples, although Antoine François Prévost used Côte dIvoire. In the 19th century, usage switched to Côte dIvoire and it retained the name through French rule and independence in 1960
8.
Ghana
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Ghana, officially the Republic of Ghana, is a unitary presidential constitutional democracy, located along the Gulf of Guinea and Atlantic Ocean, in the subregion of West Africa. Spanning a land mass of 238,535 km², Ghana is bordered by the Ivory Coast in the west, Burkina Faso in the north, Togo in the east, Ghana means Warrior King in the Soninke language. The territory of present-day Ghana has been inhabited for a millennium, numerous kingdoms and empires emerged over the centuries, of which the most powerful was the Kingdom of Ashanti. Beginning in the 15th century, numerous European powers contested the area for trading rights, following over a century of native resistance, Ghanas current borders were established by the 1900s as the British Gold Coast. On 6 March 1957, it became the first sub-Saharan African nation to become independent of European colonisation, a multicultural nation, Ghana has a population of approximately 27 million, spanning a variety of ethnic, linguistic and religious groups. Five percent of the population practices traditional faiths,71. 2% adhere to Christianity and 17. 6% are Muslim and its diverse geography and ecology ranges from coastal savannahs to tropical jungles. Ghana is a country led by a president who is both head of state and head of the government. Ghanas economy is one of the strongest and most diversified in Africa, following a century of relative stability. Ghanas growing economic prosperity and democratic political system have made it a power in West Africa. It is a member of the Non-Aligned Movement, the African Union, the Economic Community of West African States, Group of 24, Ghana was already recognized as one of the great kingdoms in Bilad el-Sudan by the ninth century. Ghana was inhabited in the Middle Ages and the Age of Discovery by a number of ancient predominantly Akan kingdoms in the Southern and this included the Ashanti Empire, the Akwamu, the Bonoman, the Denkyira, and the Mankessim Kingdom. Until the 11th century, the majority of modern Ghanas territorial area was unoccupied and uninhabited by humans. Although the area of present-day Ghana in West Africa has experienced many population movements, by the early 11th century, the Akans were firmly established in the Akan state called Bonoman, for which the Brong-Ahafo Region is named. From the 13th century, Akans emerged from what is believed to have been the Bonoman area, to create several Akan states of Ghana and these states included Bonoman, Ashanti, Denkyira, Mankessim Kingdom, and Akwamu Eastern region. By the 19th century, the territory of the part of Ghana was included in the Kingdom of Ashanti. The Kingdom of Ashanti government operated first as a loose network, prior to Akan contact with Europeans, the Akan Ashanti people created an advanced economy based on principally gold and gold bar commodities then traded with the states of Africa. The earliest known kingdoms to emerge in modern Ghana were the Mole-Dagbani states, the Mole-Dagombas came on horseback from present-day Burkina Faso under a single leader, Naa Gbewaa. The death of Naa Gbewaa caused civil war among his children, some of whom broke off and founded separate states including Dagbon, Mamprugu, Mossi, Nanumba, Akan trade with European states began after contact with Portuguese in the 15th century
9.
Togo
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Togo, officially the Togolese Republic, is a country in West Africa bordered by Ghana to the west, Benin to the east and Burkina Faso to the north. It extends south to the Gulf of Guinea, where its capital Lomé is located, Togo covers 57,000 square kilometres, making it one of the smallest countries in Africa, with a population of approximately 7.5 million. From the 11th to the 16th century, various tribes entered the region from all directions. From the 16th century to the 18th century, the region was a major trading center for Europeans to search for slaves, earning Togo. In 1884, Germany declared Togoland a protectorate, after World War I, rule over Togo was transferred to France. Togo gained its independence from France in 1960, in 1967, Gnassingbé Eyadéma led a successful military coup détat after which he became president. At the time of his death in 2005, Gnassingbé was the leader in modern African history. In 2005, his son Faure Gnassingbé was elected president, Togo is a tropical, sub-Saharan nation, highly dependent on agriculture, with a climate that provides good growing seasons. The official language is French, with other languages spoken in Togo. The largest religious group in Togo consists of those with indigenous beliefs, Togo is a member of the United Nations, African Union, Organisation of Islamic Cooperation, South Atlantic Peace and Cooperation Zone, La Francophonie and Economic Community of West African States. Archaeological finds indicate that ancient tribes were able to produce pottery and that name Togo is translated from Ewe language language as land where lagoons lie. Not much is known of the period before arrival of the Portuguese in 1490, during the period from the 11th century to the 16th century, various tribes entered the region from all directions, the Ewé from the east, and the Mina and Guin from the west. Most of them settled in coastal areas, in 1884, a treaty was signed at Togoville with the King Mlapa III, whereby Germany claimed a protectorate over a stretch of territory along the coast and gradually extended its control inland. Its borders were defined after the capture of hinterland by German forces and signing agreements with France, in 1905, this became the German colony of Togoland. The local population was forced to work, cultivate cotton, coffee and cocoa, a railway and the port of Lomé were built for export of agricultural products. The Germans introduced modern techniques of cultivation of cocoa, coffee and cotton, during the First World War, Togoland was invaded by Britain and France, proclaiming the Anglo-French condominium. On 7 December 1916 the condominium collapsed and Togo was divided into British,20 July 1922 Great Britain received the League of Nations mandate to govern the western part of Togo and France to govern the eastern part. In 1945, the received the right to send three representatives to the French parliament
10.
Benin
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Benin, officially the Republic of Benin and formerly Dahomey, is a country in West Africa. It is bordered by Togo to the west, Nigeria to the east, the majority of its population lives on the small southern coastline of the Bight of Benin, part of the Gulf of Guinea in the northernmost tropical portion of the Atlantic Ocean. The capital of Benin is Porto-Novo, but the seat of government is in Cotonou, Benin covers an area of 114,763 square kilometers and its population in 2015 was estimated to be approximately 10.88 million. Benin is a nation, highly dependent on agriculture, with substantial employment. The official language of Benin is French, however, indigenous languages such as Fon and Yoruba are commonly spoken. The largest religious group in Benin is Roman Catholicism, followed closely by Islam, Vodun and this region was referred to as the Slave Coast from as early as the 17th century due to the large number of slaves shipped to the New World during the Trans-Atlantic slave trade. After slavery was abolished, France took over the country and renamed it French Dahomey, in 1960, Dahomey gained full independence from France, and had a tumultuous period with many different democratic governments, many military coups and military governments. A Marxist–Leninist state called the Peoples Republic of Benin existed between 1975 and 1990, in 1991, it was replaced by the current multi-party Republic of Benin. During the colonial period and at independence, the country was known as Dahomey, on 30 November 1975 it was renamed to Benin, after the body of water on which the country lies—the Bight of Benin—which, in turn, had been named after the Benin Empire. The country of Benin has no connection to Benin City in modern Nigeria, the form Benin is the result of a Portuguese corruption of the city of Ubinu. The new name, Benin, was chosen for its neutrality, the current country of Benin combines three areas which had different political and ethnic systems prior to French colonial control. Before 1700, there were a few important city states along the coast, the situation changed in the 1600s and early 1700s as the Kingdom of Dahomey, which was of Fon ethnicity, was founded on the Abomey plateau and began taking over areas along the coast. The Dahomey Kingdom was known for its culture and traditions, young boys were often apprenticed to older soldiers, and taught the kingdoms military customs until they were old enough to join the army. This emphasis on preparation and achievement earned Dahomey the nickname of black Sparta from European observers. The kings of Dahomey sold their war captives into transatlantic slavery, by about 1750, the King of Dahomey was earning an estimated £250,000 per year by selling Africans to the European slave-traders. Court protocols, which demanded that a portion of war captives from the many battles be decapitated, decreased the number of enslaved people exported from the area. The number went from 102,000 people per decade in the 1780s to 24,000 per decade by the 1860s, the decline was partly due to the banning of the trans-Atlantic slave trade by Britain and other countries. This decline continued until 1885, when the last slave ship departed from the coast of the present-day Benin Republic bound for Brazil, a former Portuguese colony, the capitals name Porto-Novo is of Portuguese origin, meaning New Port
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