How Many Rainforests Exist? Types, Major Forests & Global Count

Rainforests aren't a monolith. They're classified by climate zone, yielding two primary types—each with distinct ecology, distribution, and conservation status.

The Two Main Types

Tropical Rainforests

• Latitude: ~10°N–10°S (equatorial belt)
• Climate: Warm year-round (25–27°C), no frost; high rainfall (2,000–10,000+ mm); no dry season or brief
• Structure: Multi-layered canopy (emergent, canopy, understory, forest floor)
• Biodiversity: Highest on Earth—~50% of terrestrial species
• Soils: Generally nutrient-poor (oxisols/ultisols); nutrients in biomass

Temperate Rainforests

• Latitude: Mid-latitudes (~35°–55°)
• Climate: Cool, moist; distinct seasons; high rainfall (1,500–5,000+ mm) often from orographic lift
• Structure: Fewer canopy layers; conifer-dominated (N. Hemisphere) or broadleaf (S. Hemisphere)
• Biodiversity: Lower than tropical but high endemism; massive biomass
• Soils: Deeper, more fertile; thick organic layers

How Many Rainforests? The WWF Count

The World Wildlife Fund (WWF) identifies ~23 distinct rainforest ecoregions globally (Global 200 list). This isn't a count of individual forest patches but of biogeographically distinct units with unique species assemblages.

Major Rainforests by Region

Tropical

• Amazon (South America) — 5.5M km²; largest, most biodiverse; 9 nations
• Congo Basin (Central Africa) — 3.7M km²; 2nd largest; 6 nations
• Borneo (SE Asia) — 743k km²; 3 nations; oldest rainforest (~140 Myr)
• Sumatra (Indonesia) — 250k km²; critically endangered; orangutans, tigers, rhinos
• New Guinea — 786k km²; 2 nations; extreme endemism, cultural diversity
• Madagascar — Unique lemurs, baobabs; 90%+ endemic
• Atlantic Forest (Brazil) — 15% remains; hyper-endemic, urban pressure
• Western Ghats (India) — Biodiversity hotspot; monsoon-driven

Temperate

• Pacific Northwest (USA/Canada) — Hoh, Queets, Tongass (largest temperate rainforest, 68k km²)
• Valdivian (Chile/Argentina) — Gondwanan relicts; alerce, monkey puzzle
• Tasmanian (Australia) — Cool temperate; ancient lineages
• Japanese temperate rainforests — Yakushima, etc.
• New Zealand (Fiordland, West Coast) — Podocarp/broadleaf
• Caucasus (Georgia, Turkey, Iran) — Colchic refugium

Why the Count Matters

Each ecoregion represents irreplaceable evolutionary history. Losing one isn't just losing trees—it's losing millions of years of unique co-evolution. Conservation prioritization (e.g., Key Biodiversity Areas, Alliance for Zero Extinction sites) operates at this resolution.