Benin–Nigeria border

The border then proceeds to the south, utilising the Okpara for circa 100 miles, various small streams, and several overland sections, before terminating at the Bight of Benin.

In 1900 the administration of these areas was transferred to the British government, with the Northern and Southern (including Lagos and Calabar) protectorates united as the colony of Nigeria in 1914.

[3][2] This border was confirmed by a treaty of 19 October 1906, with some minor changes made in 1912 following on-the-ground demarcation which were later finalised officially via an exchange of notes in 1914.

[2][3] The section between the Atlantic and the Okpara river was marked on the ground by 142 concrete beacons, the boundary being formed by a straight line between them.

[2] As the movement for decolonisation grew in the post-Second World War era, Britain and France gradually granted more political rights and representation for their African colonies.