Mpumalanga: the plateau ends in a step that faces the rising sun.

The name carries the orientation. Mpumalanga means «east» in the Nguni languages and, literally, «the place where the sun rises». The province covers 76,495 square kilometres in north-eastern South Africa and, at the 2022 census, had 5,142,216 inhabitants. But an account by area and population misses the essential: Mpumalanga is understood by standing on a ledge, with your back to one side of the world and your face to another.

01 One step, two countries

The Great Escarpment of the Drakensberg splits the province in two. To the west lies the Highveld, a high grassland plateau that runs from about 1,700 to 2,300 metres. To the east, the Lowveld, a much lower savanna plain, at around 800 metres by the average heights usually quoted. The difference between the two is on the order of a thousand metres, and the escarpment, which exceeds 2,000 metres along most of its length, is the wall between them.

What is striking is how little the two sides resemble each other. At Belfast, on the Highveld, the January average is a 23 °C maximum and June drops to a 1 °C minimum; at Mbombela, in the Lowveld, January reaches a 29 °C maximum and July does not fall below a 6 °C minimum. It is the same province with the same name on the map, and temperature, vegetation and the rhythm of the towns change within a few kilometres of road.

02 The wall that catches the water

A wall of more than two thousand metres facing a low plain is also an obstacle for clouds. The escarpment is the part of the province that receives the most precipitation, and you notice it as soon as you reach it: waterfalls, morning mist and vegetation that does not belong to the grassland left above. Around Sabie and Graskop lies one of the largest forestry-plantation areas in the country, to the point that Ngodwana, near those forests, hosts one of the largest paper mills in South Africa.

Without that wall and that water, Mpumalanga would be something else: a dry plateau dropping to a savanna. What exists instead is a narrow, damp strip where the rivers of the Highveld plunge before they reach the plain.

03 A canyon that does not look like one

The Blyde River runs through 26 kilometres of canyon at the foot of the escarpment, and its oddest trait is colour. It is often cited as the third-largest canyon in the world, after the Grand Canyon and the Fish River Canyon, but unlike those two it is a «green canyon»: dominated by subtropical vegetation, not bare rock. Look down from the rim and what you see is a ravine lined with bush and a thread of water at the bottom.

There is another detail of water and stone along the same stretch. At Bourke's Luck, where the Blyde and the Treur meet, the grinding of pebbles and sand has hollowed smooth potholes up to six metres across into the rock; the place is named after a gold prospector, Tom Burke, who staked a claim nearby without ever finding significant gold. And at the Kadishi gorge, the tufa waterfall of about 200 metres, cited as the second tallest of its kind in the world, is the result of water running over dolomite, absorbing calcium and depositing it faster than the current erodes it.

04 The oldest rocks in the crust

South of the canyon, near Barberton, the eastern wall hides another kind of time. The Makhonjwa Mountains make up about 40 % of the Barberton greenstone belt, and UNESCO inscribed them in 2018 as a World Heritage Site for holding the best-preserved succession of volcanic and sedimentary rock of its age, dating from 3.6 to 3.25 billion years ago. They are among the oldest exposed rocks on Earth and hold some of the oldest known traces of life, with evidence of microbial life about 3.2 billion years old.

A word of geology was born here too: komatiites, a type of ultramafic lava, are named after the Komati River, which crosses the belt. And in the belt's layers there are eight spherule beds, droplets of vaporised rock, that record meteorite impacts between 3.5 and 3.2 billion years ago. Any route that follows the geology of the place, such as the Barberton Geotrail, walks through that history without digging: it is exposed on the hillside.

05 What lies below

From the ledge, the east is the Lowveld, the low part of the province: a subtropical plain of savanna and the southern half of Kruger National Park, which spreads over about 20,000 square kilometres. Altitude is lost there, and with it the escarpment's mist; the landscape is another one, warmer and more open, and the provincial capital, Mbombela, lies there.

Mpumalanga can then be explained with a single act: stop at the edge. To the west lies the plateau facing the interior of the continent. To the east, the step drops and the plain begins, where the sun rises, and the whole province, with its green canyon, its waterfalls, its forests and its rocks from three billion years ago, is what happens along that wall.