The 17 megadiverse countries
The megadiverse-country classification identifies 17 countries with exceptionally important concentrations of biodiversity and endemic species. It is a conservation classification, not an annual ranking from most to least biodiverse.
Research reviewed 1 October 2026 · Sources & methodology
Why endemism matters as well as species richness
Species richness counts how many species occur in a place. Endemism asks how many occur nowhere else. A country containing a species’ entire natural range has a different conservation responsibility from one containing a small portion of a widespread species’ range.
The classification described by UNEP-WCMC uses a threshold of at least 5,000 endemic plant species and the presence of marine ecosystems. These criteria explain why simply sorting countries by land area or by one animal group does not reproduce the list. Plant endemism and the range of ecosystems are part of the underlying concept.
Large areas, tropical environments and isolated evolutionary histories can contribute to biodiversity, but they do not all work in the same way. Brazil and the Democratic Republic of the Congo contain major tropical forest systems; Madagascar and Australia illustrate the importance of distinctive biotas. The classification brings together different ecological settings rather than a single landscape type.
The complete 17-country classification
The countries are listed alphabetically. There is no defensible “number one” implied by this set: a species count for birds, plants or marine life could yield different orders. Selecting one group and calling it total biodiversity would change the measure.
17 countries. Scroll the table for all entries.
 Australia | Oceania | Canberra |
|---|---|---|
 Brazil | Americas | Brasília |
 China | Asia | Beijing |
 Colombia | Americas | Bogota |
 Democratic Republic of the Congo | Africa | Kinshasa |
 Ecuador | Americas | Quito |
 India | Asia | New Delhi |
 Indonesia | Asia | Jakarta |
 Madagascar | Africa | Antananarivo |
 Malaysia | Asia | Kuala Lumpur |
 Mexico | Americas | Mexico City |
 Papua New Guinea | Oceania | Port Moresby |
 Peru | Americas | Lima |
 Philippines | Asia | Manila |
 South Africa | Africa | Pretoria (administrative), Cape Town (legislative), Bloemfontein (judicial) |
 United States | Americas | Washington D.C. |
 Venezuela | Americas | Caracas |
No countries match these filters. Try another name or reset the filters.
The list includes continental countries and island or archipelagic countries. It also crosses economic and political categories. Megadiverse status does not indicate membership in a single trade group, income band or climate zone, and it does not mean every part of a listed country is equally species-rich.
Megadiversity is not a conservation score
A country can have globally important biodiversity while facing serious habitat loss. The classification concerns the biological importance of what occurs there; it does not certify the effectiveness of present-day protection. Conversely, a country outside the list can still contain highly threatened habitats and species that need protection.
To compare conservation outcomes, more specific evidence is needed: trends in habitat extent, species abundance, extinction risk, ecological connectivity and management effectiveness. The share of land designated as protected is useful context, but designation alone does not show the condition of ecosystems or whether protection is effective.
Country borders are also an imperfect ecological boundary. Forests, river basins and migration routes extend across them. A country list helps organize national responsibilities, while many conservation questions require evidence at the ecosystem or species-range level.
Common sources of confusion
Is the Like-Minded Megadiverse Countries group identical?
No. That name refers to an intergovernmental cooperation group. A diplomatic membership list and a scientific conservation classification can overlap without being the same set. This page follows the 17-country classification described by UNEP-WCMC.
Does being outside the tropics rule a country out?
No. The United States and China are included, and large countries can contain multiple climatic and ecological zones. Latitude alone is an inadequate rule for deciding membership.
Can the list tell me where to see the most wildlife?
Not by itself. The visibility of wildlife depends on habitat, season, access and particular species. A national biodiversity classification is far too broad to predict what a visitor will encounter at a specific site. Use country profiles as a geographic starting point, then investigate the ecosystem of interest.
Sources & methodology
We use the established 17-country classification rather than inventing a biodiversity score or mixing it with diplomatic-group membership. Alphabetical ordering avoids implying a numerical rank.
- UNEP-WCMC: Megadiverse countries
Documents the 17-country classification, the role of endemism and the plant and marine-ecosystem criteria.
- Convention on Biological Diversity
Primary reference for international biodiversity policy and conservation objectives.
Country lists follow our 196-profile directory convention: 193 UN members, Vatican City, Palestine and Taiwan. Dependent territories are identified separately. A missing observation never means zero.