What is baro salient?

Some articles on baro, baro salient:

Akobo River - History
... proposed drawing the line down the middle of the Akobo River and parts of the Pibor River and Baro River ... Treaty of 1902, resulting in an area in the Ethiopian Gambela Region called the Baro Salient ... The Baro Salient is more closely connected to South Sudan than Ethiopia, both in terms of natural features and people ...