The Lower Guinean forests is region of coastal tropical moist broadleaf forest extending along the coast of the Gulf of Guinea from eastern Benin through Nigeria and Cameroon.
The Dahomey Gap, a region of savanna and dry forest in Togo and Benin, divides the Lower Guinean forests from the Upper Guinean forests to the west, which extend from Togo to Guinea. To the north and northeast, the Lower Guinean forests transition to the drier inland Guinean forest-savanna mosaic and Northern Congolian forest-savanna mosaic and to the south by the Congolian Coastal forests. To the east, the Lower Guinean forests adjoin the vast Coastal Congolian forests of the Congo Basin, and to the southeast, the Lower Guinean forests are bounded by the Western Congolian forest-savanna mosaic.
The Lower Guinean forests share many biotic affinities with both the Upper Guinean forests. They are collectively known as the Guinean Forests of West Africa.
The World Wide Fund for Nature (WWF) divides the Lower Guinean forests into a number of distinct ecoregions:
The WWF has designated two regions of the Lower Guinean forests as Global 200 priority regions for conservation. The WWF's Coastal Congolian forests region includes the Cross-Sanaga Bioko coastal forests, São Tomé and Príncipe moist lowland forests, and Atlantic Equatorial coastal forests ecoregions. The Cameroon Highlands forests Global 200 region includes the Cameroonian Highlands forests and the Mount Cameroon and Bioko montane forests ecoregions.