Where is Johannesburg located on the Highveld and the Witwatersrand?

Johannesburg is located on the Highveld, a broad, grassy plateau that spans the interior of South Africa at an elevation ranging from approximately 5,700 to 5,930 feet (1,740 to 1,810 metres).1

Within this region, the city bestrides the Witwatersrand—a ridge of gold-bearing rock that serves as a watershed between the drainage basins of the Vaal and Limpopo rivers, ultimately directing water toward the Atlantic and Indian oceans. Johannesburg developed near the center of this ridge, specifically situated on the edge of the Witwatersrand Main Reef, a significant subterranean stratum of gold-bearing conglomerate.21