The Abyei Administrative Area (AAA) is a contested zone located on the central border between South Sudan and Sudan. Its status has remained unresolved since South Sudan seceded from Sudan in 2011, and the governments failed to agree on the border division. A United Nations peacekeeping mission, the United Nations Interim Security Force for Abyei (UNISFA), has since monitored the situation. It is entrusted with overseeing demilitarisation and maintaining security in the area.