Democratic Republic of the Congo–South Sudan border

[3] The process culminated in the Berlin Conference of 1884, in which the European nations concerned agreed upon their respective territorial claims and the rules of engagements going forward.

[3][2] However the treaty also leased large areas of land in Central Africa to the Congo Free State, including the Lado Enclave.

[2][3] Administration of the Congo Free State was taken over by the Belgian government in 1908 following controversies engendered by the atrocities committed by Leopold's forces there.

[5] The Belgian lease over Lado was terminated by an Anglo-Belgian treaty of 14 May 1910, and the area was thereafter annexed to Sudan.

The porous boundary today is extremely insecure owing to the after-effects of civil wars in South Sudan, DRC and CAR, as well as the Lord's Resistance Army insurgency which has spilled over from Uganda.