Mafadi is a peak on the border of South Africa and Lesotho. At a height of 3,450 m, it is the highest mountain in South Africa, but is lower than Thabana Ntlenyana, the highest peak in Lesotho and, at , the highest in Southern Africa. Mafadi lies at S 29 12 08.4 E 29 21 25.5 in the WGS84 format.
Ascents of Mafadi, attempted from the South African side, are normally made from the Injasuthi campsite. The route involves about an eight-kilometre hike to Marble Baths. This is followed by continuing up the river and with a combination of short paths and boulder hopping. This all ends at the bottom of the ridge, which leads to the Molar, with a campsite. The subsequent path up the ridge to the top of the mountains is known as Leslie's Pass. The path follows the ridge until below a rock band where it traverses to southern side. The way continues up a short scree section, followed by more hiking up quite a steep gradient, until the final 20 metres are made up a grassy slope. From here, the top of Leslie's Pass (at S 29 09 12.7 E 29 20 38.0), the top of the mountains are followed to Mafadi.