RAINFOREST INFORMATION

A Place Out of Time: Tropical Rainforests and the Perils They Face - information on tropical forests, deforestation, and biodiversity

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BACKGROUND INFORMATION ON THE RAINFOREST

Rainforests are forest ecosystems characterized by high levels of rainfall, an enclosed canopy and high species diversity. While tropical rainforests are the best-known type of rainforest and the focus of this section of the web site, rainforests are actually found widely around the world, including temperate regions in Canada, the United States, and the former Soviet Union.

Tropical rainforests typically occur in the equatorial zone between the Tropic of Cancer and Tropic of Capricorn, latitudes that have warm temperatures and relatively constant year-round sunlight. Tropical rainforests merge into other types of forest depending on the altitude, latitude, and various soil, flooding, and climate conditions. These forest types form a mosaic of vegetation types which contribute to the incredible diversity of the tropics.

The bulk of the world's tropical rainforest occurs in the Amazon Basin in South America. The Congo Basin and Southeast Asia, respectively, have the second and third largest areas of tropical rainforest. Rainforests also exist on some the Caribbean islands, in Central America, in India, on scattered islands in the South Pacific, in Madagascar, in West and East Africa outside the Congo Basin, in Central America and Mexico, and in parts of South America outside the Amazon. Brazil has the largest extent of rainforest of any country on Earth.

Rainforests provide important ecological services, including storing hundreds of billions of tons of carbon, buffering against flood and drought, stabilizing soils, influencing rainfall patterns, and providing a home to wildlife and Indigenous people. Rainforests are also the source of many useful products upon which local communities depend.

While rainforests are critically important to humanity, they are rapidly being destroyed by human activities. The biggest cause of deforestation is conversion of forest land for agriculture. In the past subsistence agriculture was the primary driver of rainforest conversion, but today industrial agriculture — especially monoculture and livestock production — is the dominant driver of rainforest loss worldwide. Logging is the biggest cause of forest degradation and usually proceeds deforestation for agriculture.

Organization of this site

The rainforest section of Mongabay is divided into ten "chapters" (the original text for the site was a book, but has since been adapted for the web), with add-on content in the form of special focal sections (e.g. The Amazon, the Congo, REDD, New Guinea, Sulawesi, Forests in Brazil, etc), appendices, and other resources.

There is also a version of the site geared toward younger readers at kids.mongabay.com.

ABOUT THE RAINFOREST (SUMMARY)

RAINFOREST DISTRIBUTION AND CHARACTERISTICS

Each rainforest is unique, but there are certain features common to all tropical rainforests.

• Location: rainforests lie in the tropics.
• Rainfall: rainforests receive at least 80 inches (200 cm) of rain per year.
• Canopy: rainforests have a canopy, which is the layer of branches and leaves formed by closely spaced rainforest trees some 30 meters (100 feet) off the ground. A large proportion of the plants and animals in the rainforest live in the canopy.
• Biodiversity: rainforests have extraordinarily highs level of biological diversity or “biodiversity”. Scientists estimate that about half of Earth's terrestrial species live in rainforests.
• Ecosystem services: rainforests provide a critical ecosystem services at local, regional, and global scales, including producing oxygen (tropical forests are responsible for 25-30 percent of the world's oxygen turnover) and storing carbon (tropical forests store an estimated 229-247 billion tons of carbon) through photosynthesis; influencing precipitation patterns and weather; moderating flood and drought cycles; and facilitating nutrient cycling; among others.

The global distribution of tropical rainforests can be broken up into four biogeographical realms based roughly on four forested continental regions: the Afrotropical, the Australiasian, the Indomalayan/Asian, and the Neotropical. Just over half the world's rainforests lie in the Neotropical realm, roughly a quarter are in Africa, and a fifth in Asia.

These realms can be further divided into major tropical forest regions based on biodiversity hotspots, including:

1. Amazon: Includes parts of Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, Venezuela
2. Congo: Includes parts of Cameroon, Central African Republic, Democratic Republic of the Congo, Equatorial Guinea, Gabon, Republic of Congo
3. Australiasia: Includes parts of Australia, Indonesian half of New Guinea, Papua New Guinea
4. Sundaland: Includes parts of Brunei, Indonesia, Malaysia, Singapore
5. Indo-Burma: Includes parts of Bangladesh, Cambodia, China, India, Laos, Myanmar, Thailand, Vietnam
6. Mesoamerica: Includes parts of Belize, Costa Rica, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panama
7. Wallacea: Sulawesi and the Maluku islands in Indonesia
8. West Africa: Includes parts of Benin, Cameroon, Côte d'Ivoire, Ghana, Guinea, Liberia, Nigeria, Sierra Leone, Togo
9. Atlantic forest: Includes parts of Argentina, Brazil, Paraguay
10. Choco: Includes parts of Colombia, Ecuador, Panama

Other countries that have large areas of rainforest include Bolivia, Cameroon, Central African Republic, Ecuador, Gabon, Guyana, India, Laos, Malaysia, Mexico, Myanmar, Papua New Guinea, Republic of Congo, Suriname, and Venezuela.

Cover and loss by rainforest region

RAINFOREST STRUCTURE

Rainforests are characterized by a unique vegetative structure consisting of several vertical layers including the overstory, canopy, understory, shrub layer, and ground level. The canopy refers to the dense ceiling of leaves and tree branches formed by closely spaced forest trees. The upper canopy is 100-130 feet above the forest floor, penetrated by scattered emergent trees, 130 feet or higher, that make up the level known as the overstory. Below the canopy ceiling are multiple leaf and branch levels known collectively as the understory. The lowest part of the understory, 5-20 feet (1.5-6 meters) above the floor, is known as the shrub layer, made up of shrubby plants and tree saplings.

RAINFOREST BIODIVERSITY

Tropical rainforests support the greatest diversity of living organisms on Earth. Although they cover less than 2 percent of Earth’s surface, rainforests house more than 50 percent of the plants and animals on the planet.

THE RAINFOREST CANOPY

In the rainforest most plant and animal life is not found on the forest floor, but in the leafy world known as the canopy. The canopy, which may be over 100 feet (30 m) above the ground, is made up of the overlapping branches and leaves of rainforest trees. Scientists estimate that more than half of life in the rainforest is found in the trees, making this the richest habitat for plant and animal life.

The conditions of the canopy are markedly different from the conditions of the forest floor. During the day, the canopy is drier and hotter than other parts of the forest, and the plants and animals that live there have adapted accordingly. For example, because the amount of leaves in the canopy can make it difficult to see more than a few feet, many canopy animals rely on loud calls or lyrical songs for communication. Gaps between trees mean that some canopy animals fly, glide, or jump to move about in the treetops. Meanwhile plants have evolved water-retention mechanisms like waxy leaves.

Scientists have long been interested in studying the canopy, but the height of trees made research difficult until recently. Today the canopy is commonly accessed using climbing gear, rope bridges, ladders, and towers. Researchers are even using model airplanes and quadcopters outfitted with special sensors — conservation drones — to study the canopy.

The rainforest floor

The rainforest floor is often dark and humid due to constant shade from the leaves of canopy trees. The canopy not only blocks out sunlight, but dampens wind and rain, and limits shrub growth.

Despite its constant shade, the ground floor of the rainforest is the site for important interactions and complex relationships. The forest floor is one of the principal sites of decomposition, a process paramount for the continuance of the forest as a whole. It provides support for trees responsible for the formation of the canopy and is also home to some of the rainforest's best-known species, including gorillas, tigers, tapirs, and elephants, among others.

Rainforest waters

Tropical rainforests support some of the largest rivers in the world, like the Amazon, Mekong, Negro, Orinoco, and Congo. These mega-rivers are fed by countless smaller tributaries, streams, and creeks. For example, the Amazon alone has some 1,100 tributaries, 17 of which are over 1,000 miles long. Although large tropical rivers are fairly uniform in appearance and water composition, their tributaries vary greatly.

Rainforest waters are home to a wealth of wildlife that is nearly as diverse as the biota on land. For example, more than 5,600 species of fish have been identified in the Amazon Basin alone.

But like rainforests, tropical ecosystems are also threatened. Dams, deforestation, channelization and dredging, pollution, mining, and overfishing are chief dangers.

Rainforest people

Tropical rainforests have long been home to tribal peoples who rely on their surroundings for food, shelter, and medicines. Today very few forest people live in traditional ways; most have been displaced by outside settlers, have been forced to give up their lifestyles by governments, or have chosen to adopt outside customs.

Of the remaining forest people, the Amazon supports the largest number of Indigenous people living in traditional ways, although these people, too, have been impacted by the modern world. Nonetheless, Indigenous peoples' knowledge of medicinal plants remains unmatched and they have a great understanding of the ecology of the Amazon rainforest.

In Africa there are native forest dwellers sometimes known as pygmies. The tallest of these people, also called the Mbuti, rarely exceed 5 feet in height. Their small size enables them to move about the forest more efficiently than taller people.

There are few forest peoples in Asia living in fully traditional ways. The last nomadic people in Borneo are thought to have settled in the late 2000's. New Guinea and the Andaman Islands are generally viewed as the last frontiers for forest people in Asia and the Pacific.

Deforestation

In recent decades there has been an important shift in deforestation trends. Today export-driven industries are driving a bigger share of deforestation than ever before, marking a shift from previous decades, when most tropical deforestation was the product of poor farmers trying to put food on the table for their families. There are important implications from this change. While companies have a greater capacity to chop down forests than small farmers, they are more sensitive to pressure from environmentalists. Thus in recent years, it has become easier—and more ethical—for green groups to go after corporations than after poor farmers.

Rainforests are also threatened by climate change, which is contributing to droughts in parts of the Amazon and Southeast Asia. Drought causes die-offs of trees and dries out leaf litter, increasing the risk of forest fires, which are often set by land developers, ranchers, plantation owners, and loggers.

Rainforest importance

While rainforests may seem like a distant concern, they are critically important for our well-being. Rainforests are often called the lungs of the planet for their role in absorbing carbon dioxide, a greenhouse gas, and producing oxygen, upon which all animals depend for survival. Rainforests also stabilize climate, house incredible amounts of plants and wildlife, and produce nourishing rainfall all around the planet.

Rainforests:

• Help stabilize the world’s climate: Rainforests help stabilize the world’s climate by absorbing carbon dioxide from the atmosphere. Scientists have shown that excess carbon dioxide in the atmosphere from human activities is contributing to climate change. Therefore, living rainforests have an important role in mitigating climate change, but when rainforests are chopped down and burned, the carbon stored in their wood and leaves is released into the atmosphere, contributing to climate change.
• Provide a home to many plants and animals: Rainforests are home to a large number of the world’s plant and animals species, including many endangered species. As forests are cut down, many species are doomed to extinction.
• Help maintain the water cycle: The role of rainforests in the water cycle is to add water to the atmosphere through the process of transpiration (in which plants release water from their leaves during photosynthesis). This moisture contributes to the formation of rain clouds, which release the water back onto the rainforest. In the Amazon, 50-80 percent of moisture remains in the ecosystem’s water cycle. When forests are cut down, less moisture goes into the atmosphere and rainfall declines, sometimes leading to drought. Rainforests also have a role in global weather patterns. For example researchers have shown that forests in South America affect rainfall in the United States, while forests in Southeast Asia influence rain patterns in southeastern Europe and China. Distant rainforests are therefore important to farmers everywhere.
• Protect against flood, drought, and erosion: Rainforests have been compared to natural sponges, moderating flood and drought cycles by slowing run-off and contributing moisture to the local atmosphere. Rainforests are also important in reducing soil erosion by anchoring the ground with their roots. When trees are cut down there is no longer anything to protect the ground, and soils are quickly washed away with rain. On steep hillsides, loss of forest can trigger landslides.
• Are a source for medicines and foods and support forest-dependent people: People have long used forests as a source of food, wood, medicine, and recreation. When forests are lost, they can no longer provide these resources. Instead people must find other places to get these goods and services. They also must find ways to pay for the things they once got for free from the forest.

Rainforest conservation

Rainforests are disappearing very quickly. The good news is there are a lot of people who want to save rainforests. The bad news is that saving rainforests will be a challenge as it means humanity will need to shift away from business-as-usual practices by developing new policies and economic measures to creative incentives for preserving forests as healthy and productive ecosystems.

Over the past decade there has been considerable progress on several conservation fronts. Policymakers and companies are increasingly valuing rainforests for the services they afford, setting aside large blocks of forests in protected areas and setting up new financial mechanisms that compensate communities, state and local governments, and countries for conserving forests. Meanwhile, forest-dependent people are gaining more management control over the forests they have long stewarded. Large international companies are finally establishing policies that exclude materials sourced via deforestation. People are abandoning rural areas, leading to forest recovery in some planes.

But the battle is far from over. Growing population and consumption means that rainforests will continue to face intense pressures. At the same time, climate change threatens to dramatically alter temperatures and precipitation patterns, potentially pushing some forests toward critical tipping points.

Thus the future of the world's rainforests in very much in our hands. The actions we take in the next 20 years will determine whether rainforests, as we currently know them, are around to sustain and nourish future generations of people and wildlife.

The Latest News on Rainforests

Francis Hallé, the botanist who took a raft into the rainforest canopy (Jan 22 2026)
- The richest part of a tropical rainforest is often the hardest to study: the canopy, where much of its biodiversity lives beyond reach from the ground. Francis Hallé helped change that by finding ways to observe the treetops without cutting them down.
- A French botanist, biologist, and illustrator, he became known for the “canopy raft,” a platform set onto the crowns of trees by a balloon. It turned the upper forest from a place described in theory into one examined up close.
- Hallé was an expert in tropical forest ecology and “the architecture of trees,” a way of identifying trees by how they grow and branch. He paired field science with drawing and plain speech, and he was unsparing about the forces driving deforestation.
- In his later years he pursued a long-term plan to restore a “primeval forest” in Western Europe, left to evolve with minimal human interference over centuries. It was, in his view, a test of whether societies could think beyond the political moment.

Indonesia revokes forest and mine permits over role in deadly Sumatra landslides (Jan 22 2026)
- Indonesia has revoked the permits of 28 companies after a post–Cyclone Senyar audit found environmental violations that authorities say worsened deadly floods and landslides in Sumatra in late 2025, which killed about 1,200 people.
- The revoked permits cover about 1 million hectares of forests and include major players such as pulpwood producer PT Toba Pulp Lestari, marking a shift toward framing permit enforcement as post-disaster accountability.
- Two high-profile projects in the Batang Toru ecosystem were hit: a nearly completed hydropower plant and the Martabe gold mine, both long criticized for operating in landslide-prone terrain that’s the only habitat of the critically endangered Tapanuli orangutan.
- Environmental groups have welcomed the revocations, but warn the move is incomplete, calling for transparency, ecosystem restoration, protection against permit transfers to new operators, and broader action to halt deforestation in vulnerable watersheds.

How US intervention could deepen Venezuela’s environmental crisis (Jan 20 2026)
- Following the removal of Venezuelan President Nicolás Maduro, the U.S. has expressed interest in the country’s oil and minerals. But the current landscape means that a rushed investment could be disastrous for the environment, critics warn.
- Venezuela has an estimated 300 billion barrels of proven crude oil reserves, the largest in the world. But decaying infrastructure and corruption make investment almost impossible, with a high risk of spills inside sensitive ecosystems.
- The country also has massive mineral deposits, many of them in the rainforest and on Indigenous territory. The mines are largely controlled by criminal groups, making U.S. involvement there extremely complicated, critics said.

Too many African plants fall into the IUCN’s ‘not evaluated’ trap (commentary) (Jan 20 2026)
- Of the approximately 350,000 vascular plant species in the world, only about 18% have been assessed by the IUCN Red List, and the situation is starker still if one looks at just tropical African species.
- Further, IUCN’s “not evaluated” category simply means a species has not yet been assessed against Red List criteria, and in practice, African conservationists often meet a more confusing reality: Many species are not on the global Red List at all but are still informally talked about as if they are NE.
- “Here’s a constructive way forward via “Red List + Reality” decision rules…A stronger system could combine global assessments with local intelligence,” a new commentary suggests.
- This article is a commentary. The views expressed are those of the author, not necessarily of Mongabay.

Indonesia sues 6 companies over alleged links to deadly floods & landslides (Jan 19 2026)
- Indonesia’s environment ministry is seeking 4.8 trillion rupiah ($284 million) in environmental damages from six companies it has linked to deadly floods and landslides triggered by Cyclone Senyar in November.
- Following the disasters, the ministry launched an investigation into dozens of companies in the region; the findings determined six companies were responsible for alleged damage to watersheds in North Sumatra.
- The areas affected include Batang Toru, an ecologically fragile ecosystem home to the Tapanuli orangutan, the world’s rarest great ape.

Colombia poised for another drop in deforestation in 2025, data show (Jan 16 2026)
- Deforestation in Colombia appears to have declined in 2025, with notable reductions in several departments like Meta, Caquetá and Guaviare.
- The main drivers of deforestation include the spread of cattle ranching and agriculture, as well as illicit crops like coca, the primary ingredient in cocaine.
- Officials attributed the declining trend to collaboration with Indigenous communities and environmental zoning in rural areas, as well as ecotourism and a program providing financial incentives for communities involved in forest conservation.

Hopes and fears as Guinea exports iron ore from Simandou mines (Jan 16 2026)
- After decades of planning, the first shipment of iron ore from Guinea’s Simandou mines is on its way to China.
- The shipment marks the beginning of an era in which Guinea is expected to become one of the world’s leading producers of iron ore.
- Environmental advocates say that damage from the mines so far has gone largely unaddressed.

Indonesia says 4 million hectares of plantation, mining lands reclaimed in crackdown (Jan 14 2026)
- The Indonesian government says it has reclaimed more than 4 million hectares of land used for plantations, mining and other activities inside officially designated forest areas.
- This is part of a sweeping crackdown on illegal activities in forest areas, carried out by a year-old task force formed by President Prabowo Subianto.
- Land seizures have exceeded the initial target by 400%, officials say, and the scale of the enforcement raises questions about how many oil palm plantations in the country are actually illegal.
- The task force has recovered about 2.3 trillion rupiah (about $136 million) in administrative fines, collected from 20 oil palm companies and one nickel mining company; it remains unclear what the money will be used for — and what will happen to the seized plantations and mines.

Myanmar’s botanical data gaps risk its unique flora, collaborations could help, study says (Jan 13 2026)
- Home to snowcapped mountains, drought-prone savannas and tropical rainforests, Myanmar hosts tremendous botanical diversity among its richly varied habitats.
- There are 864 known plant species that are found only in the conflict-torn country, yet critical knowledge gaps remain.
- Researchers recently compiled what is known about Myanmar’s flora, identifying key research gaps and priority areas where conservation efforts for plants are most urgently needed.
- They urge collaborative and systematic action to fill in data gaps and protect floristically diverse areas and avoid irreversible species losses.

Photos: Kew Gardens’ top 10 newly named plants and fungi for 2025 (Jan 12 2026)
- Scientists at the Royal Botanic Gardens, Kew, formally named 125 plants and 65 fungi in 2025, including a zombie fungus that parasitizes Brazilian spiders, a bloodstained orchid from Ecuador, and a fire-colored shrub named after a Studio Ghibli character.
- Up to three out of four undescribed plant species are already threatened with extinction, with at least one species described this year possibly already extinct in its native Cameroon habitat.
- An estimated 100,000 plant species and between 2 million and 3 million fungal species remain to be described and formally named by science.
- Many newly described species face immediate threats from habitat loss, illegal collection and climate change, highlighting the urgent need to protect areas before species disappear.

When Indigenous knowledge enters the scientific record (Jan 12 2026)
Founder’s Briefs: An occasional series where Mongabay founder Rhett Ayers Butler shares analysis, perspectives and story summaries. For most of Peru’s scientific history, Indigenous knowledge has existed outside the formal record. It shaped how forests were used, how species were managed, and how risk was understood, but rarely appeared in journals or policy. The boundary […]

Indonesia launches sweeping environmental audits after Sumatra flood disaster (Jan 7 2026)
- After Cyclone Senyar killed more than 1,100 people across Sumatra, the Indonesian government has acknowledged that deforestation and land-use changes — not extreme weather alone — amplified the scale of floods and landslides.
- In a significant shift, authorities are now explicitly linking disaster impacts to development decisions and corporate activity, signaling that permits will not shield companies from accountability.
- The government has launched a three-track response: rapid disaster impact assessments, reviews of provincial zoning plans, and environmental audits of more than 100 companies across extractive and infrastructure sectors.
- Civil society groups have cautiously welcomed the move, but note that meaningful reform will depend on whether Jakarta is willing to revise permissive zoning plans that legally enable large-scale forest conversion.

Urban sprawl and illegal mining reshape a fragile Amazon frontier (Jan 6 2026)
- Ever since Mitú was first established as a settlement in 1935, it has rapidly transformed into an expanding urban town in one of Colombia’s most isolated departments.
- The Amazonian forests, rivers and Indigenous communities who surround Mitú are impacted by urbanization, the overexploitation of natural resources, cattle ranching, illegal mining and timber extraction which have caused deforestation, soil degradation and water pollution.
- Researchers say the construction of a highway from Mitú to Monfort has attracted settlers who cleared land around the road to expand the urban center and develop agricultural production and cattle ranching.
- Mongabay found 10,000 hectares (24,710 acres) of tree cover loss in Mitú since 2014.

After Cyclone Senyar, Indonesia probes whether development amplified scale of disaster (Jan 6 2026)
- Cyclone Senyar triggered catastrophic floods and landslides in northern Sumatra in late 2025, but scientists and activists say decades of deforestation and landscape alteration in upland watersheds largely determined the scale of the destruction.
- The heavily hit Batang Toru landscape, home to the world’s only Tapanuli orangutan population, has become a national test case after the government ordered eight mining, energy and plantation companies to halt operations pending rare watershed-wide environmental audits.
- Investigations have raised concerns that forest clearing by a pulpwood producer, a hydropower project and a gold mine on steep terrain may have destabilized slopes and worsened runoff during extreme rainfall.
- Experts warn that once forest cover is lost in fragile tropical watersheds, disaster risks can persist for decades, making effective law enforcement — rather than weather alone — decisive for Batang Toru’s future.

Massive Amazon conservation program pledges to put communities first (Jan 5 2026)
- The Amazon Region Protected Areas (ARPA) is a massive conservation program that has helped reduce deforestation across 120 conservation areas in the Brazilian Amazon and avoided 104 million metric tons of CO2 emissions between 2008 and 2020.
- A new phase of the program, called ARPA Comunidades, will now focus on supporting the communities who live in and protect the forest, by helping them increase their revenue through the bioeconomy or sale of sustainable forest products.
- Backed by a $120 million donor fund, ARPA Comunidades aims to increase protections across 60 sustainable-use reserves in the Brazilian Amazon spanning an area nearly the size of the U.K., directly impacting 130,000 people and helping raise 100,000 out of poverty.