Central African Republic–Republic of the Congo border

[1] The border starts in the west at the tripoint with Cameroon in the Sangha River, and then proceeds via a straight line overland towards the northwest.

[2] It then follows the Lobaye-Gouga drainage divide up to the Democratic Republic of the Congo tripoint at the confluence of the Gouga and Ubangi.

[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.

As a result of this France gained control the upper valley of the Niger River (roughly equivalent to the areas of modern Mali and Niger), and also the lands explored by Pierre Savorgnan de Brazza for France in Central Africa (roughly equivalent to modern Gabon and Congo-Brazzaville).

[3] From these bases the French explored further into the interior, eventually linking the two areas following expeditions in April 1900 which met at Kousséri in the far north of modern Cameroon.