Pibor River: Natural history
The Pibor, Baro, Gilo, and Akobo rivers all drain the Ethiopian Highlands. The Baro River is by far the largest, contributing 83% of the total water flowing into the Sobat River. During the rainy season, between June and October, the Baro River alone contributes about 10% of the Nile's water at Aswan, Egypt. In contrast, these rivers have very low flow during the dry season.