The Makhonjwa Mountains are a range of small mountains and hills that covers an area of 120 by 60 kilometres, about 80% in Mpumalanga, a province of South Africa, and the remainder in neighbouring Eswatini. It constitutes 40% of the Barberton Greenstone Belt. The area ranges in altitude from 600 to 1,800 meters above mean sea level.
Makhonjwa Mountains are the world's oldest geological structure. The range is best known for having some of the oldest exposed rocks on Earth, estimated to be between 3.2 and 3.6 billion years (Ga) old, dating from the Paleoarchean. The mountain range's extreme age and exceptional preservation have yielded some of the oldest undisputed signs of life on Earth and provide insight into the hostile nature of the Precambrian environment under which this life evolved. This has led to the area being otherwise known as the "Genesis of life".
The range is also known for its gold deposits and a number of komatiites, an unusual type of ultramafic volcanic rock named after the Komati River that flows through the belt. It has a number of rocky hills, with moist grassy uplands and forested valleys.
Economically speaking, mining is declining, and the main activities are now timber harvesting and grazing. Commercial plantations grow pine and eucalyptus.
According to Wikipedia