Mano River, river rising in the Guinea Highlands northeast of Voinjama, Liberia. With its tributary, the Morro, it forms more than 90 miles (145 km) of the Liberia–Sierra Leone border. The river and its affluents (including the Zeliba) drain a basin of 3,185 square miles (8,250 square km). It follows a 200-mile (320-km) southwesterly course through the Gola National Forest in Liberia and empties into the Atlantic at Mano Salija, Sierra Leone. Intermittent rapids impede its navigability. The Mano River Bridge, completed in 1976, spans the river at Bo Waterside, Liberia, reducing the distance by road between the capitals of Liberia and Sierra Leone.