What does ecoregion mean?
An ecoregion is a relatively large area of land or water that is distinguished from neighbouring areas by its climate, terrain, soils, hydrology, and above all by the communities of native species that live there. Unlike a biome, which describes broad global categories such as tundra or tropical rainforest, an ecoregion draws specific boundaries around a particular place, making it a practical unit for scientific mapping and conservation planning. Organisations such as WWF classify the world's land into hundreds of terrestrial ecoregions, alongside marine and freshwater equivalents, and use them to prioritise areas of high biodiversity for protection. The word appears most often in ecology, geography, environmental policy, and nature writing, where precision about place matters. For anyone interested in how scientists organise and defend the natural world, ecoregion is one of the key working terms.
nounA geographically distinct area defined by its characteristic climate, landforms, soils, and native plants and animals. Ecoregions are used by conservationists and scientists as units for mapping and protecting biodiversity.
- A geographically bounded area characterized by a distinctive combination of environmental conditions and native biodiversity.
"The Sonoran Desert ecoregion supports plant and animal species found nowhere else on Earth."
"Conservation groups have identified this ecoregion as a global priority for protection."
"The park spans two ecoregions, giving visitors a remarkable range of landscapes in a single day."
Regular plural; standard in scientific and conservation literature when referring to multiple classified regions.
"Australia's ecoregions range from tropical rainforests to arid interior deserts."
WWF's map of the world's ecoregions divides the entire planet into just over 800 distinct pieces — and each one has its own unique cast of species.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of ecoregion
The word ecoregion is a modern compound formed from the combining form eco-, derived from Greek 'oikos' meaning house or habitat, and 'region', which entered English via Old French from Latin 'regio', meaning direction, district, or territory. The term arose in twentieth-century ecological and geographical writing as scientists sought precise units for classifying landscapes by their living systems rather than political borders. It shares the eco- element with related coinages such as ecology and ecosystem, both also rooted in the same Greek noun.
How ecoregion is actually used
Ecoregion is a technical term used chiefly in ecology, geography, and conservation science; in everyday speech, broader terms like 'region' or 'biome' are more common. The word carries a neutral, scientific register.
Easily confused with ecoregion
A biome is a broad global category defined mainly by vegetation and climate (e.g., tropical rainforest), while an ecoregion is a more specific geographic unit with defined boundaries and local species.