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A bioregion is an ecologically and geographically defined area that is smaller than an ecozone, but larger than an ecoregion or an ecosystem, in the World Wildlife Fund classification scheme. There is also an attempt to use the term in a rank-less generalist sense, similar to the terms "biogeographic area" or "biogeographic unit".
The WWF scheme further subdivides the ecozones into bioregions, defined as "geographic clusters of ecoregions that may span several habitat types, but have strong biogeographic affinities, particularly at taxonomic levels higher than the species level (genus, family)." The WWF bioregions are as follows:
- Afrotropic ecozone
- Antarctic ecozone
- Australasia ecozone
- Indomalaya ecozone
- Nearctic ecozone
- Neotropical ecozone
- Oceania ecozone
- Palearctic ecozone
- East Asia north of the Himalayan system's foothills to the arctic
- Central Asia - Iranian Plateau and north to the arctic.
- Western Asia
- Northern Africa
- Europe (Northern, Middle, Eastern, Southwestern, and Southeastern Europe biocountries) - Mediterranean to the arctic.
- Vilhena, D., Antonelli, A. (2015). A network approach for identifying and delimiting biogeographical regions. Nature Communications 6, 6848, .
- Berg, P. and Dasmann, R. (1977). Reinhabiting California. The Ecologist 7 (10): 399-401.
- Miller, K. 1999. What is bioregional planning?. In: R. Crofts, E. Maltby, R. Smith and L. Maclean (eds). Integrated Planning: International Perspectives. Battleby, Scotland 7–9 April 1999: IUCN & Scottish Natural Heritage.
- Dinerstein, E., Olson, D. Graham, D.J. et al. (1995). A Conservation Assessment of the Terrestrial Ecoregions of Latin America and the Caribbean. World Bank, Washington DC., .
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