Forests cover roughly 31% of the planet’s land area, yet no two are quite alike. Geographers group them into broad types based mainly on latitude, climate and the trees that dominate them. Understanding these categories makes it far easier to picture where a forest sits on the globe and what lives inside it.
This guide walks through the major forest types from the equator to the poles, explains the vertical layers found inside a forest, and links through to our fully illustrated forests section where you can explore each one in depth.
How forests are classified
The single biggest factor is climate — specifically temperature and rainfall, which are driven largely by latitude. Tropical forests sit near the equator where it is warm and wet year-round; temperate forests occupy the mid-latitudes with four distinct seasons; and boreal forests ring the far north where winters are long and harsh.
Within each band, the amount and timing of rainfall, the altitude, and the local soils decide which trees take hold — broadleaf evergreens, deciduous hardwoods, or needle-leaved conifers.
The main types of forest
| Forest type | Where it is found | Defining feature |
|---|---|---|
| Tropical rainforest | Equatorial belt (Amazon, Congo, SE Asia) | Hot and wet all year; the richest biodiversity on Earth |
| Tropical dry forest | Seasonal tropics (India, Central America) | Distinct wet and dry seasons; many trees shed leaves in the drought |
| Temperate deciduous | Eastern US, Europe, East Asia | Broadleaf trees that drop their leaves each autumn |
| Temperate coniferous | Pacific Northwest, parts of Europe | Evergreen conifers; includes towering old-growth |
| Boreal forest (taiga) | Canada, Scandinavia, Russia | The largest land biome; cold-hardy spruce, pine and fir |
| Mediterranean | California, Mediterranean basin, Chile | Hot dry summers, mild wet winters; tough evergreen shrubs and oaks |
| Mangrove | Tropical and subtropical coastlines | Salt-tolerant trees rooted in tidal mud |
| Cloud / montane forest | High tropical mountains | Persistently wrapped in mist; dripping with mosses and ferns |
The four layers of a forest
Most dense forests — rainforests especially — are organised into vertical layers, each with its own light, humidity and wildlife.
- Emergent layer — the tallest trees that punch through the roof of the forest, bathed in full sun and wind.
- Canopy — the dense, continuous roof of treetops that captures most of the sunlight and shelters the majority of forest species.
- Understorey — a dim zone of young trees, shrubs and large-leaved plants adapted to low light.
- Forest floor — deep shade where fungi, insects and decomposers recycle fallen leaves into nutrients.
Why the differences matter
Forest type decides almost everything about an ecosystem — which animals can live there, how much carbon it stores, how it responds to fire, and how people have used it for timber, food and medicine for millennia. Rainforests hold the greatest number of species; boreal forests and peat-rich forests store immense amounts of carbon; mangroves shield coastlines from storms and erosion.
Frequently asked questions
What are the three main types of forest?
At the broadest level, forests are grouped into tropical (near the equator, warm and wet), temperate (mid-latitudes with four seasons) and boreal or taiga (the cold far north). Each of these splits into finer types such as rainforest, deciduous, coniferous and mangrove.
What is the largest type of forest in the world?
The boreal forest, or taiga, is the largest land biome on Earth. It forms a near-continuous belt of conifers across Canada, Scandinavia and Russia, just south of the Arctic tundra.
What is the difference between a rainforest and a regular forest?
A rainforest receives very high rainfall — typically over 2,000 mm a year — and stays warm and humid, which supports layered canopies and exceptional biodiversity. Temperate and boreal forests have cooler, more seasonal climates and far fewer species.
What are the four layers of a forest called?
From top to bottom they are the emergent layer, the canopy, the understorey and the forest floor. Each layer receives different amounts of light and supports different plants and animals.