One of six vast land areas, each with distinctive kinds and numbers of plants and animals: The biogeographic realms are Nearctic, the Palearctic, the Afrotropical, the Indomalayan, the Australasian, the Neotropical, the Oceanian, and the Antarctic.

A region where a group's culture prevails: A cultural realm can be explained as a large geographical area where the people share a common cultural background, like the language, the way of life, religion, and traditions.