evidence: South Sudan- Central African Republic: periodic violent skirmishes persist among related pastoral populations along the border with the Central African Republic over water and grazing rights [...] South Sudan-Ethiopia: the unresolved demarcation of the boundary and lack of clear limitation create substantial room for territorial conflict both locally among the border populations and between the two capitals; besides a large number of indigenous farmers, the border region supports refugees and various rebel groups opposed to the governments in Khartoum and Addis Ababa [...] South Sudan-Sudan: present boundary represents 1 January 1956 alignment, which clearly placed the Kafia Kingi area (adjacent to Central African Republic) within South Sudan as shown on US maps although it is mostly occupied by Sudan; final alignment pending negotiations and demarcation; the final sovereignty status of Abyei Area pending negotiations between South Sudan and Sudan; clashes continue in the oil-rich Abyei region; the United Nations interim security Force for Abyei (UNISFA) has been deployed since 2011, when South Sudan became independent, Sudan accuses South Sudan of supporting Sudanese rebel groups