Unraveling the Mysteries of Africa's Longest River: River Niger in Nigeria We weren’t able to create a summary for you. Refresh your page to try again. Apr 19, 2026 · Niger River , principal river of western Africa . With a length of 2,600 miles (4,200 km), it is the third longest river in Africa , after the Nile and the Congo. The Niger is believed to have been named by the Greeks. Along its course it is known by several names. Apr 19, 2026 · Niger River , principal river of western Africa . With a length of 2,600 miles (4,200 km), it is the third longest river in Africa , after the Nile and the Congo. The Niger is believed to have been named by the Greeks. Along its course it is known by several names. With a length of 2,600 miles (4,200 km), it is the third longest river in Africa, after the Nile and the Congo. The Niger is believed to have been … The Niger River is the principal river of western Africa, extending over 2,500 miles (about 4,180 km). The Niger River, the largest river in West Africa, stretches approximately 2,600 miles (4,180 kilometers) and flows through ten countries, impacting the lives of over 100 million people. Its drainage basin is 2,117,700 km2 (817,600 sq mi) in area. Its source is in the Guinea Highlands in south-eastern ….