Central African Republic–Chad border

Three straight lines then form an overland section of the boundary, until reaching the Petit Sido river, whereupon it follows the following rivers all the way to the Sudanese tripoint: the Grand Sido, Chari, Bahr Aouk, Samoybayn (also known as the Madeam), Aoukalé and the Mare de Tizi.

[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 of 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).

[2] 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.

has a large presence in CAR and has repeatedly crossed the border in an attempt to secure the frontier.