The highlands of Mount Cameroon and of Bioko island, above 900 meters elevation, are a distinct ecoregion, the Mount Cameroon and Bioko montane forests, as are the Cameroonian Highlands forests further inland. To the west, across the Cross River, lies the Cross-Niger transition forests ecoregion. Towards the drier interior, the coastal forests transition to the Guinean forest-savanna mosaic to the north and the Northern Congolian forest-savanna mosaic to the east. South of the Sanaga River along the coast lies the Atlantic Equatorial coastal forests ecoregion.