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Encyclopedic overview
Holarctic realm
The Holarctic realm is a biogeographic realm that comprises the majority of habitats found throughout the continents in the Northern Hemisphere. It corresponds to the floristic Boreal kingdom. It includes both the Nearctic zoogeographical region (which covers most of North America), and Alfred Wallace's Palearctic zoogeographical region (which covers North Africa, and all of Eurasia except for Southeast Asia, the Indian subcontinent, and the southern Arabian Peninsula).
Excerpted from Wikipedia’s “Holarctic realm” article, available under the CC BY-SA 4.0 licence.