The Guinea–Liberia boundary was first delimited by France and Liberia in 1892 using long straight line segments, but it was completely redrawn in 1907 using linear topographic features as much as possible. Further adjustments were made in 1911, which produced a 641 km boundary following the Liberian banks of various rivers (notably the Makona, Nianda, and Mani Rivers), connected by numerous straight line segments. The boundary was surveyed and demarcated by a mixed commission between 1926 and 1929, resulting in additional minor adjustments to the line. Although the border is porous and there are occasional tensions relating to military encroachments and use of the boundary rivers, the boundary alignment is not disputed.