In Guinea they are known as Dorsale Guinéenne. The highest peak in the region is Mount Bintumani in Sierra Leone, at 1,945 metres (6,381 ft). Other peaks include Sankan Biriwa (1,850 metres (6,070 ft)) in Sierra Leone and Mount Richard-Molard (Mount Nimba) (1,752 metres (5,748 ft)) on the border of Guinea and Côte d'Ivoire. The highlands mostly lie between 300 and 500 metres (980 and 1,640 ft) above sea level.
The Guinea Highlands are the source of many of West Africa's rivers, including the Niger River, West Africa's longest river, the Senegal and Gambia rivers, and the rivers of Sierra Leone, Liberia, Maritime Guinea, and western Côte d'Ivoire.
The Guinea Highlands form the transition between the Western Guinean lowland forests, moist tropical rainforests that lie to the south between the Guinea Highlands and the Atlantic Ocean, and the Guinean forest-savanna mosaic to the north.
The Guinean montane forests ecoregion covers the portion of the highlands above 600 meters elevation. It includes montane forests, grasslands, and savannas, with a distinct flora and fauna from the surrounding lowlands.