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Biogeographic realm

Broadest biogeographic division of Earth's land surface / From Wikipedia, the free encyclopedia

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A biogeographic realm is the broadest biogeographic division of Earth's land surface, based on distributional patterns of terrestrial organisms. They are subdivided into bioregions, which are further subdivided into ecoregions. A biogeographic realm is also known as "ecozone", although that term may also refer to ecoregions.

Map of the world's biogeographic realms in Miklos Udvardy's system.
  Antarctic (not shown)