Chad–Sudan border

The border then forms a very irregular line down to the tripoint with the Central African Republic, delimited by numerous small streams, hills and other features.

[2] 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.

[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.

[4] Relations steadily deteriorated in later years as Chad became caught up in the War in Darfur, resulting in large numbers of refugees crossing the border.

[5][6] The subsequent proxy war between Chad and Sudan resulted in numerous cross-border incursions and fighting, until a peace treaty was arranged in 2010.