Gambia–Senegal border

[1] In the north-west, the border starts at the Atlantic coast at Jinnak Creek, and then proceeds eastwards via a straight line.

[2] Just to the west of the Gambian town of Ngeyen Sanjal the border proceeds to roughly parallel the north bank of the Gambia river at a distance of about 10 km, bending round in the far east to encompass Koina and Kantale Kunde within Gambian territory, before proceeding westwards again at about 10 km parallel to the river's southern bank.

In 1821 Britain established a formal colony on the coast of modern Gambia, threatening nearby French coastal settlements.

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 1982 to 1989 the two states were loosely united in the Senegambia Confederation, however this legal coupling was dissolved by Senegal after Gambia refused to transition towards a closer union.