31 Amazon Basin Facts: All You Need To Know About This River System

Ayan Banerjee
Jan 10, 2023 By Ayan Banerjee
Originally Published on Jan 24, 2022
Edited by Sarah Nyamekye
Fact-checked by Sudeshna Nag
Learn all about the Amazon basin biome and people living in that area.

Among all the rainforests and humid forests in this world, the Amazon Rainforest in South America currently stands as the largest rainforest.

The Amazon River across South America is the world's biggest waterway by streamflow capacity and the world's reputed longest river. The Amazon basin, the world's biggest, comprises over 40% of the South American continent, or 2.9 million sq mi (7.5 million sq km).

The canopy has existed for at least 55 million years, and much of the territory was devoid of great plains biomes until the present Ice Age when the weather became drier and grassland became more common.

The Amazon rainforests have grown as a result of a stream channel whose water levels oscillate by up to 50 ft (15.2 m) yearly in the mid and bottom Amazon. In 1541, a Spanish soldier named Francisco de Orellana became the first European to investigate the Amazon.

He gave the river basin its title after describing intense conflicts with sword wielder tribes, he compared it to the Amazons of Greek mythology and thus named it so.

The apparently limitless Amazon has lost roughly 17% of its forested land during the previous half-century, its interconnectivity has deteriorated, and countless indigenous species have indeed been exposed to cycles of fossil fuel extraction.

Amazon's economic transition is gaining traction, based on the conversion and destruction of its natural ecosystem.

However, as those factors gain power, we are discovering that the Amazon serves a key role in preserving the changes in climatic patterns, at a global and regional level, which helps the population of the globe to gain some hope.

The Amazon Rainforest acts as a carbon sink by absorbing huge amounts of carbon dioxide and thus it maintains the global oxygen cycle. It generates around 6-9% of the world's oxygen.

The Amazon River began as an intercontinental river 10-11 million years ago and changed form about 2.4 million years ago, according to the experts. The findings are in line with previous studies that put the beginning of an eastward-flowing Amazon River around 10 million years ago.

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The Geographical Location Of The Amazon Basin

The Amazon River starts in the Andes Mountains in the west of the basin, with the Negro River being its largest tributary. It is one of the world's two longest rivers, with a length of around 3,976.8 mi (6,400 km) before draining into the Atlantic Ocean.

The Amazon River is longer than the Nile, according to a group of Brazilian experts, although the exact length is still up for discussion. The Amazon River system conveys the most water of any river system, accounting for around 17-20% of all water delivered to the seas by rivers.

The inter-Andean plateau, just a couple of miles out from the Pacific Ocean, is home to its most distant sources.

Streams from the west made their way through the sandstone and the Amazon started to flow eastward, resulting in the development of the Amazon Rainforest 11-10 million years ago. Sea levels decreased throughout glacial eras, and the enormous Amazon lake quickly evacuated and formed a river, ultimately becoming the world's second-biggest, drowning the world's greatest rainforest.

With the expansion of cattle ranches and soybean crops, certain Amazon forests are being deforested. Until the Andes range existed, the Amazon basin flowed west to the Pacific Ocean, but after its formation, the basin was forced to flow east to the Atlantic Ocean.

The basin is split politically between the Brazilian Amazôn, Peruvian Amazon, Colombia's Amazon region, and sections of Bolivia, Ecuador, and Venezuela's Amazonas state. The two tributaries of the Amazon River that flow through Colombia are Putumayo and Caqueta.

Constituting global systems, Amazon biodiversity influences the global carbon cycle and consequently climate change, along with hemispheric hydrological processes, providing a crucial anchor for South American climate and rainfall.

The Amazon River basin accounts for the dry season and the rainy season when the rivers flood the low-lying forests near to them.

Seasonal floods exhume and arrange nutrient-dense silt onto beaches and islands, allowing dry-season riverbank cultivation of rice, beans, and maize along the river's shoreline without the need for fertilizer, as well as slash-and-burn agriculture on higher floodplains during the dry season.

The Amazon River basin has a dry seasonal pattern and also has rainy seasons, during which the rivers flood the poorly lying forests near to them. The basin's climate is usually hot and humid.

However, cold snaps can occur in some regions throughout the winter months between June and September, powered by Antarctic winds blowing over the adjacent mountain range. The typical yearly temperature is between 77-91 F (25-32.8 C), with little discernible difference between summer and winter.

Historians are fetching information of those places where humans could not set up civilizations using primary continuity theory.

During certain periods in the Amazon basin, with exceeding temperature natural compromises occurred in the tundra, coniferous and deciduous forests (which later turned out into grassland). The fires that have raged over grasslands throughout history have had a significant impact on this region.

Intermediate successional changes can occur as a result of disturbances such as agricultural clearings, wildfires, illnesses, and strong storms that generate gaps in a forest, re-establishing the usual flora for that climate region.

The Features Of The Amazon Basin

The Amazon region is an important carbon sink, while it consumes the greenhouse gas which comes from the fossil fuels' combustion. Martin Strel, a guy from Germany, swam the full length of the Amazon River in 2007. Martin waded in the water for up to 10 hours a day for 66 days to complete his spectacular jungle adventure.

The direction that the course of Amazon follows is from west to east then into the region of northern South America. The river begins in Peru's mountain ranges and flows through Ecuador, Colombia, Brazil, Bolivia, and Peru before discharging into the Atlantic Ocean.

Amazon's streams do not all overflow at the very same period of the year. In November, several limbs commence to flood, and the water level may keep climbing until June.

The Rio Negro rises in February or March and then starts falling in June. The Madeira River is two months ahead of the majority of the Amazon River in terms of rising and falling.

Nowadays plants are acquiring more complex structures with certain dynamic processes. It started from the time of North and South America, Australia, and Madagascar segregation.

Floras started becoming adaptive after gradual isolation. The Amazon Rainforest is home to 400-500 indigenous Amerindian tribes. Approximately 50 of these tribes are said to have never had touch with the outside world.

The canopy coverage of the Amazon helps control humidity and temperature, and it is closely related to regional weather patterns via hydrological cycles that rely on the forests. Given the massive quantity of carbon stored in Amazonian jungles, there is a huge risk of global climate change if they are not properly managed.

The Amazon River has 99.2-154.3 billion ton (90-140 billion metric ton) of carbon, and releasing even a small amount of it will drastically intensify global warming.

Agricultural expansion and deforestation in the Amazon presently emit up to 0.55 billion ton (0.5 billion metric ton) of carbon dioxide every year, not considering the emission of forest fires, making the Amazon an essential player in global climate regulation.

The Amazon ground is always gloomy equal to the thickness of the canopy (the upper twigs and leaves of the trees). It's so dense, for example, that when it showers, the water needs 10 minutes to touch the floor.

The Amazon Rainforest is claimed to produce up to 75% of its own rainwater, which would be used to feed surrounding rivers via the process of evaporation and transpiration among its river. The water from the rivers travels straight into the ocean, sustaining vital ocean circulation and influencing area climate.

Amazon Basin Biome: Plants And Animals

The Amazon is a thick moist forest along with savannas, tropical trees, floodplain forests, swamps, bamboos, grasslands, and palm forests present in modest amounts. Here, the animal inhabitants and plants' diversity is very large because of a large amount of downfall.

A huge dense roof canopy covers the whole Amazon that also restricts the sunlight from coming down. Brazil nuts, rubber trees, and assai palms are among the tropical trees native to the Amazon.

Polluted air as well as other persistent disruptions are currently causing incipient harm to forestry and plants all over the world, while the signs can be subtle and difficult to attribute to a specific contaminant. They include everything from the eradication of shrubby algae communities from tree bark to the death of the trees altogether.

In reaction to persistent contamination, surface waters undergo similar alterations. In the streams, the pollution was initiated with the process of eutrophication.

Excessive algae or cyanobacteria started causing oxygen depletion and with exceeding biochemical oxygen demand (BOD) it was hard to sustain aquatic balance.

Human civilizations made so many compromises upon the natural ecosystem which caused hassles for terrestrial and marine populations. Humans are subsequently facing famine and health issues.

The Amazon basin is home to around 1,500 bird species. The multitude of bird families that live in these forests contributes to the Amazon's biodiversity and adds to the unique and diverse bird species.

Ducks flock in droves near those regions of the Amazon River basin that has rich clay content, and macaws are well-known there too.

The macaws and other groups of parrots depend on the clay soil so much that they even venture out to river banks in the western Amazon practically every day to drink clay, except perhaps on wet days. Their dependence on the clay leads them to compromise their protection.

The Amazon basin is home to around 1,500 amphibian species that swim. Different from temperate frogs, which are generally found near water, tropical frogs are primarily located in trees, with only a few found near pools of water on the forest floor.

The Amazon system is home to over 2,500 fish species, with an estimated 1,000 more species still to be discovered. Known Amazonian fish species consist of 45 % of the total are unique to the basin, the number stands at 1,000 species.

Some of the Amazon basin's major fish groups are pike cichlids, peacock cichlids, and relatives of subfamily Cichlidae, suckermouth catfishes, guppies and relatives, bony-tongues, and many more.

The Amazon River houses more than 1,400 animal species, the bulk of which are bats and rodents. The Amazon basin mammals include cheetah, ocelot, caimans, puma, and South American Tapir.

Insects make up more than 90% of the animal species within the Amazon River basin, with beetles accounting for around 40% of them out of which Coleoptera accounts for almost 25% of all known animal life-forms.

Electric eels, piranhas feeding on meat, jaguars, poison dart frogs, and some very poisonous snakes are just a few of the interesting and dangerous wildlife that live in the vast region of the Amazon.

Amazon Basin Tribes And Their Language

Portuguese is the most frequently spoken language in the Amazon, followed by Spanish. On the Brazilian side, Portuguese is spoken by at least 98% of the population, whereas indigenous languages are spoken by a substantial number of people in Spanish-speaking nations, but Spanish is the main language.

Hundreds of indigenous languages still exist in the Amazon, the majority of which are spoken by only a few individuals and are consequently critically endangered.

Amazonia has a low population density. There are a few smaller towns inland, but the majority of the population resides in a few bigger cities along the Amazon along with other major rivers, such as Iquitos, Peru, Manaus, and Belém.

The Amazon Rainforest has been cut in several areas for soya bean fields and grazing (the most widespread non-forest use of the land); other residents or inhabitants grow wild rubber latex and Brazil nuts.

The locals live in beehive-shaped thatched dwellings. They also construct 'Maloca', or apartment-style dwellings with a slanting roof. The Amazon River serves as the primary form of transportation for people and goods in the region, with everything from bamboo rafts and dugout boats to handcrafted wooden riverboats and sophisticated steel armored vessels.

Among Amazonian countries, there are few tribe groups that are not even recognized yet.

In Bolivia there are 6-10 uncontacted groups living in the Amazon region, in Venezuela there is a couple of 100 people who have made two to three different groups, in Ecuador, there seems to exist three of such groups with less than 300 people.

In Brazil a couple of thousand people cumulated 77 different tribal groups, where we can find 12-15 groups incorporating less than 1,000 people in Peru, in Colombia, there are three to five groups holding less than 1,000 people.

Here at Kidadl, we have carefully created lots of interesting family-friendly facts for everyone to enjoy!

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Written by Ayan Banerjee

Bachelor of Science specializing in Nautical Science

Ayan Banerjee picture

Ayan BanerjeeBachelor of Science specializing in Nautical Science

Thanks to his degree in nautical science from T.S. Chanakya, IMU Navi Mumbai Campus, Ayan excels at producing high-quality content across a range of genres, with a strong foundation in technical writing. Ayan's contributions as an esteemed member of the editorial board of The Indian Cadet magazine and a valued member of the Chanakya Literary Committee showcase his writing skills. In his free time, Ayan stays active through sports such as badminton, table tennis, trekking, and running marathons. His passion for travel and music also inspire his writing, providing valuable insights.

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Fact-checked by Sudeshna Nag

Master of Arts specializing in History

Sudeshna Nag picture

Sudeshna NagMaster of Arts specializing in History

Having earned a Master's degree in History from the Presidency University in Kolkata, Sudeshna was able to refine these skills and broaden her knowledge base. Not only is she an accomplished fact-checker, but she is also deeply invested in gender research, societal interactions, and mental health. Her professional repertoire also includes experience in translation between Bengali and English content

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