The Afrotropical realm is one of the Earth's eight biogeographic realms. It includes Sub-Saharan Africa, the southern Arabian Peninsula, the island of Madagascar, and the islands of the western Indian Ocean. It was formerly known as the Ethiopian Zone or Ethiopian Region.

The tropics are the regions of Earth surrounding the Equator. They are defined in latitude by the Tropic of Cancer in the Northern Hemisphere at 23°26′10.1″ (or 23.43613°) N and the Tropic of Capricorn in the Southern Hemisphere at 23°26′10.1″ (or 23.43613°) S. The tropics are also referred to as the tropical zone and the torrid zone.