The biogeographic regionalization of Earth's terrestrial biodiversity, known as Terrestrial Ecoregions of the World (TEOW), is made up of 867 ecoregions that are divided into 14 biomes. In addition to offering a comprehensive map of terrestrial biodiversity, TEOW also provides a global species database for ecological analyses and priority setting, a logical biogeographic framework for large-scale conservation strategies, a map for enhancing biogeographic literacy, and a foundation for the Global 200. Similarly, another author indicated that there are 14 distinct biomes, including forests, grasslands, and deserts, among the 846 ecoregions that make up the area. Ecoregions vary in size; the island group of St. Peter and St. Paul Rocks in the Atlantic Ocean is only 6 km2, while the East Siberian Taiga is 39 million km2. The following is a list of ecoregions in Nigeria, according to the Worldwide Fund for Nature.

Terrestrial ecoregions

by major habitat type

Tropical and subtropical moist broadleaf forests

Tropical and subtropical grasslands, savannas, and shrublands

Montane grasslands and shrublands

Flooded grasslands and savannas

Mangroves

Freshwater ecoregions

by bioregion

Nilo-Sudan

West Coastal Equatorial

Marine ecoregions