Pibor River

The Pibor River (also known as the River Pibor) is a river in eastern South Sudan that forms a portion of the country's border with Ethiopia. It flows north for about 320 kilometers (200 miles) from its headwaters near Pibor Post, joining the Baro River to form the Sobat River, which is a tributary of the White Nile.

The Pibor and its tributaries drain a watershed covering 10,000 km2 (3,900 sq mi). The average annual discharge of the river at its mouth is 98 m3/s (3,460 ft3/s).

The Pibor River is formed by a number of streams that join at Pibor Post, a colonial-era outpost built in 1912 and originally known as Fort Bruce. The Pibor River flows north and meets the Akobo River near Akobo. Continuing north, the Pibor is joined by the Gilo and Bela rivers on the right before joining the Baro River to form the Sobat River.

The Ethiopian Highlands are drained by the Pibor, Baro, Gilo, and Akobo rivers. The Baro River is by far the largest, accounting for 83% of all water flowing into the Sobat River. During the rainy season, between June and October, the Baro River alone contributes approximately 10% of the water to the Nile at Aswan, Egypt. During the dry season, however, these rivers have very little flow.

Length: 320 km (200 mi- shared with Ethiopia)