River, western Africa.
Rising in southeastern Guinea, its upper reach forms part of the border between Guinea and Liberia. It enters Liberia north of Gbarnga and discharges into the Atlantic Ocean after a southwesterly course of about 280 mi (450 km). Navigable for 18 mi (29 km) upstream, the river and its major tributaries drain much of Liberia and Guinea. Two arms of the river enclose Bushrod Island, site of the port of Monrovia .