Liberia–Sierra Leone border

The Liberia–Sierra Leone border is 299 km (185 mi) in length and runs from the tripoint with Guinea in the north-east to the Atlantic Ocean in the south-west.

[1] The border starts in the north at the tripoint with Guinea in the Makona river, and then proceeds overland in a south-westerly direction, before following the Magowi river for some distance; this section of the border encompasses the so-called ‘Parrot’s Beak’ of Sierra Leone's Kailahun District.

[3][4] As the African interior began to be carved up due to the Scramble for Africa in the 1880s, an Anglo-Liberian boundary treaty was signed on 11 November 1885, which utilised the Mano river as the boundary; this was then extended further northwards by mutual agreement in June 1903.

[3][2] A treaty between France and Liberia delimiting the French Guinea–Liberia border resulted in Liberia ceding a sizeable strip of territory to France, and thereby shortened the Liberia-Sierra Leone boundary to roughly its current length.

[3] Some further small adjustments were approved by treaty in January 1930, with the land sections of the border being marked on the ground with pillars.