Mafadi. Maifadi is a peak on the border of South Africa and Lesotho. At a height of 3,446.1 metres (11,306??ft), it is the highest mountain in the nation of South Africa, but is lower than Thabana Ntlenyana, the highest peak in Lesotho which is, at 3,482 metres (11,424??ft), the highest point in Southern Africa.