The Akobo River is a river on the border between South Sudan and Ethiopia. From its source in the Ethiopian Highlands near Mizan Teferi it flows west for 434 kilometres (270 mi) to join the Pibor River. The Pibor flows into the Sobat River, which in turn empties into the White Nile. The tributaries of the Akobo river include the Cechi, the Chiarini, and the Owag, on the right or Ethiopian side; and the Neubari, Ajuba and Kaia on the left or South Sudanese side.