How many terrestrial ecological regions have been classified on earth?

Terrestrial Ecoregions of the World (TEOW) is a map with a bio-geographic regionalization of the Earth’s terrestrial biodiversity. The bio-geographic units are eco-regions, which are defined as relatively large units of land or water containing a distinct assemblage of natural communities sharing a large majority of species, dynamics, and environmental conditions.  The map has been prepared through compilation and correlation of existing global and regional maps, gap-filling from landform and vegetation information, followed by reclassification and validation by regional experts.

TEOW differentiates 867 terrestrial eco-regions, classified into 14 Major Habitat Types such as forests, grasslands, or deserts. Each eco-region is portrayed in detail in terms of geographical location, area description, floral and faunal biodiversity features, current conservation status, and types and severity of threats.

 

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