naturebriefs
12:28in productionCh. 1 · Where it sits/ 12:28 · ceiling 15 min
Habitats · Conservation

Borneo lowland rain forests

The world’s richest rainforest is vanishing — and it’s happening below 1000 metres across three nations.

The Borneo lowland rain forests is an ecoregion — not a species — defined by elevation, climate and jurisdiction. It is the world’s richest rainforest by plant count. It is disappearing faster than almost any other major forest biome. Its survival depends on halting conversion to oil palm and rubber — not restoring degraded land.

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Chapters & takeaways4
  1. 0:57
    Where it sits

    It covers most of Borneo below 1000 m — and crosses all three national jurisdictions.

  2. 2:17
    How it breathes

    Its climate is relentlessly wet and thermally stable — no month drops below 200 mm rain or swings more than 10°C.

  3. 3:58
    What it holds

    It hosts the highest known plant diversity of any rainforest on Earth — 15,000 species, including 267 dipterocarps.

  4. 5:54
    How it’s falling

    It has lost over half its area in 50 years — mainly to logging, hunting and conversion for oil palm and rubber.

Worth your time?

Yes. See the whole thing.

4.5/ 5
What works
  • hosts 15,000 plant species
  • supports 380 bird species
  • contains several mammal species including the Bornean orangutan
  • covers 428,438 km² across Indonesia, Malaysia and Brunei
What does not
  • buffer fire or drought
  • regenerate quickly after commercial clearance
  • support large-scale human settlement without rapid ecological degradation
See it if
  • field ecologists
  • land-use planners
  • policy makers tracking habitat loss in Southeast Asia
Skip it if
  • general nature tourists seeking intact, accessible wilderness
The written brief1 min read

What the species is and where it came from

The Borneo lowland rain forests is an ecoregion — not a species — within the tropical and subtropical moist broadleaf forests biome. It covers 428,438 km² across Indonesia, Malaysia and Brunei.

How it works, in terms someone would actually use

It works as a continuous, humid, low-elevation forest layer across Borneo — below 1000 m — where rainfall exceeds 200 mm every month and temperature stays stable within a 10°C band.

What it gets right

It gets right the density and specificity of life: 15,000 plant species, 380 bird species, and several mammal species — including the Bornean orangutan — all sustained in one climatically stable, lowland zone.

What it does not

It does not buffer fire or drought. It does not regenerate quickly after commercial clearance. It does not support large-scale human settlement without rapid ecological degradation.

What it changed

It changed conservation priorities by concentrating global attention on Southeast Asian deforestation drivers: oil palm, rubber, logging and infrastructure.

Who it is for, and who it is not

It is for field ecologists, land-use planners, and policy makers tracking habitat loss in Southeast Asia. It is not for general nature tourists seeking intact, accessible wilderness — over half its forest cover is already gone.

Is it worth your time

Yes, if you need to understand where the world’s richest rainforest stands today — and why its collapse matters biologically and politically.

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