From the Wikipedia page 
Pochalla is a county in Boma State, South Sudan. Before the reorganisation of states, it was part of the Jonglei state. The capital of the state, where the governor and state parliament is located, is in Bor town, which is situated on the Nile River at the western end of the state. Pochalla is to the extreme east of the state, located on the border with Ethiopia. Much of the County is sandwiched between two rivers, the Akobo, which forms the national boundary to the east, and the Oboth to the west. The dominant people group are the Anuak who border the Murle to the west and the Nuer to the North, both of whom are cattle keeping tribes, who have a culture of raiding to increase their cattle numbers. To the east in Ethiopia the Anuak have had tensions with the government, so communications are weak.