Equatorial Guinea spans several ecoregions. Río Muni region lies within the Atlantic Equatorial coastal forests ecoregion except for patches of Central African mangroves on the coast, especially in the Muni River estuary. The Cross-Sanaga-Bioko coastal forests ecoregion covers most of Bioko and the adjacent portions of Cameroon and Nigeria on the African mainland, and the Mount Cameroon and Bioko montane forests ecoregion covers the highlands of Bioko and nearby Mount Cameroon. The São Tomé, Príncipe, and Annobón moist lowland forests ecoregion covers all of Annobón, as well as São Tomé and Príncipe.