mountain range in northeastern Sierra Leone, extending for about 20 miles (32 km) in a north-south direction, west of the source of the Niger River in the Guinea Highlands. Rising abruptly above the granite plateau and savanna grasslands, the range contains Mount Loma Mansa (Bintimani; 6,391 feet 【1,948 m】), the highest peak in Sierra Leone. The range is sparsely settled; parts have been set aside as a forest reserve. Several streams that feed the Bagbe and Bafi tributaries of the Sewa River rise in the mountains.