The boundary starts in the west at the tripoint with Sierra Leone on the Makona river, following this river eastwards before running overland to the southeast via a series of very irregular lines. Upon reaching the Diani/Nianda it then follows this river southwards, before turning eastwards. It then proceeds in this direction via a series of overland and riverine (such as the Djoule and Mani) sections, turning to the northeast and then finally southeast to the Ivorian tripoint on Mount Nuon in the Nimba Range.