Lesotho's geography: a country with no low ground

How high the lowest ground in Lesotho lies

Lesotho covers 30,355 square kilometres, all of it inside South Africa. Wikipedia's geography article puts the lowest point at the junction of the Makhaleng and the Orange at 1,400 metres, the figure the record carries; the travel guide Wikivoyage prints 1,388 metres, and neither gives the survey behind its number. On either figure the Southern African Development Community's description holds: Lesotho is the only state whose entire territory lies above 1,000 metres.

The top of the country is Thabana Ntlenyana, 3,482 metres on Britannica's figure and the record's, a peak on the Mohlesi ridge north of the Sani Pass whose name means "beautiful little mountain" in Sesotho. The first recorded ascent by Western mountaineers was in March 1951. Its summit is partly ringed by bogs, and peatlands spread most widely along the eastern escarpment.

Estimates of how much of the country is mountain vary with the line drawn. Britannica says two-thirds. SADC says more than 75%, with only 25% counted as lowland. Wikipedia's geography article says over 80% lies above 1,800 metres. What the three agree on is that the lowland is a minority of the surface and the highland the rest.

Where the border with South Africa runs

The boundary is 909 kilometres long and touches three South African provinces: the Free State along the west and north, KwaZulu-Natal along the eastern escarpment and the Eastern Cape in the south. Lesotho lies between latitudes 28 and 31 degrees south and longitudes 27 and 30 degrees east. Britannica notes that only two other independent states, Vatican City and San Marino, are entirely surrounded by another country, and that Lesotho depends on South Africa for access to the outside world; the nearest major port, in Wikipedia's geography article, is Durban.

The line follows the land closely. In the north-west it runs along the Caledon. The northernmost point is on the edge of South Africa's Golden Gate Highlands National Park, north-west of the village of Monontsa in Butha-Buthe district; the easternmost is just west of the South African mountain Giant's Castle in Mokhotlong district; the southernmost is Gairntoul mountain in Quthing district; and the westernmost lies in the Caledon in Mafeteng district.

Along the east the border sits on the crest of the escarpment, and the Sani Pass shows what that means. The road starts on the South African side at 1,544 metres and climbs 1,332 metres in about nine kilometres to 2,876 metres, on gradients of up to 1 in 3. The border lies at the summit, so the whole pass is in South Africa. The Basutoland government built a two-metre track up it in 1922 to link Mokhotlong with the outside, usable only by pack animals, and four-wheel-drive transport began in 1949.

Where the lowlands end and the mountains begin

The country falls into three belts that run roughly north to south, each with its own rock and soil.

The lowlands follow the Caledon River, called the Mohokare in Sesotho, along the north-western border, and run on into the Senqu valley in the south. Britannica writes that almost three-quarters of the population lives in a corridor only about 40 kilometres wide along the Caledon, and the Commonwealth's country page makes the same point in fewer words: most people live on the lower land to the west. Maseru, the capital, began as a British police camp on that north-western border.

East of the foothills the Drakensberg forms the boundary with KwaZulu-Natal, and the Maloti range runs north and south inside the country, joining the main escarpment in the north to form a plateau of 2,700 to 3,200 metres. The bedrock belongs to the Karoo Supergroup, mostly shale and sandstone, and the mountain soils are of basaltic origin; Thabana Ntlenyana itself is amygdaloidal flood basalt from the Upper Triassic and Lower Jurassic. Blockfields, blockstreams and stone garlands on the higher ground are relics of the periglacial conditions of the last glacial period.

The mountains are not empty. The plateau grasslands are not permanently inhabited, Britannica writes, but provide summer grazing for sheep and cattle tended by herders at isolated cattle posts, and deep valleys such as the Senqunyane grow wheat, peas and beans.

Where the Orange and its tributaries rise

The Orange rises in the Drakensberg in north-eastern Lesotho, crosses the whole length of the country and leaves it in Mohale's Hoek district in the south-west. It runs approximately 1,300 kilometres to the Atlantic, and with its tributary the Vaal drains a catchment of around 855,000 square kilometres. The Malibamatšo, the Matsoku and the Senqunyane feed it from the central and north-eastern mountains, and the Kometspruit runs through the south-west.

The rivers cut deep. Near Semonkong the Maletsunyane drops about 200 metres in a single fall, and Wikivoyage records that the pool below freezes over in winter.

The same escarpment sends water the other way. UNESCO's statement for the Maloti-Drakensberg Park describes the border ridge as a drainage divide for two of southern Africa's main basins: the Thukela flows east from the Drakensberg to the Indian Ocean, while the rivers of the Lesotho side, Sehlabathebe included, drain into the Senqu and so to the Atlantic.

Very little of Lesotho's surface is open water, but Wikipedia's geography article notes that much of the country's export income comes from it. The Lesotho Highlands Water Project has impounded two of them high in the mountains. Katse Dam, a double-curvature concrete arch on the Malibamatšo, is 185 metres high and stands at an elevation of 1,993 metres, and the reservoir behind it holds 1,950 million cubic metres; it was completed in 1997. Mohale Dam on the Senqunyane, a concrete-faced rockfill wall 145 metres high holding 958 million cubic metres, followed in 2004, and a 32-kilometre tunnel lets water flow between the two reservoirs in either direction. From Katse a 45-kilometre tunnel carries water through the mountains to the 'Muela power station and a 37-kilometre tunnel takes it on to the Ash River in South Africa, from where it flows to the Vaal. The water moves by gravity, which was a reason for choosing the site. The South African implementing agency, the Trans-Caledon Tunnel Authority, puts the yearly transfer at about 780 million cubic metres in its account of the second phase, which adds the Polihali Dam on the Senqu and Khubelu rivers and will flood about 5,000 hectares of valley land.

When the rain and snow arrive

Rain comes in summer. Britannica gives an average of about 710 millimetres a year, decreasing from east to west, falling mostly between October and April and often as thunderstorms; Wikipedia's geography article puts 85% of the year's rain in those months and a range from about 600 millimetres in the lowland valleys to about 1,200 millimetres on the northern and eastern escarpment. Hail is a frequent summer hazard. June is the driest month, when most of the country receives less than 15 millimetres.

The altitude keeps the country cooler than other places at the same latitude. Lowland temperatures reach 32 degrees Celsius in summer and fall to minus 7 in winter, in Britannica's figures; in the highlands readings below minus 18 are not unusual, and Wikipedia gives minus 20 at times. Winter, from May to September, is dry, but the precipitation that does fall on the mountains is snow, and Britannica writes that it snows in the mountains in every month of the year. The Maloti are usually snow-capped in winter.

Rainfall varies widely from year to year, which brings drought in some years and floods in others. In 2007 the United Nations advised the government to declare a state of emergency over drought. The 2018 to 2019 rainy season started about a month late, and rainfall between October 2018 and February 2019 ran 55 to 80% below normal; a national vulnerability assessment in March 2019 estimated that 487,857 people needed humanitarian assistance. The BTI's 2026 report records a severe drought and water shortage in Mafeteng district in December 2024 and January 2025.

What grows and lives on the high grassland

Lesotho is mostly grassland. Britannica lists Cape willows, the cheche bush used for fuel and wild olives among the indigenous trees, with many species of aloe in the cooler wet places; willows and white poplars have been introduced. On the high ground, the flora of the Maloti is mostly tussock grass and ericoid shrubs, and three ecoregions meet inside the borders: Drakensberg alti-montane grasslands and woodlands, Drakensberg montane grasslands and Highveld grasslands. Overgrazing and soil erosion have depleted the grassland and the bush on the slopes, and Britannica describes reforestation as having met with limited success.

The large mammals have mostly gone. Zebras, wildebeest, ostriches and lions were found in the country in the mid-nineteenth century, and the last lion was killed in the 1870s. Smaller antelope remain, and the rock hyrax, or dassie, is common. Sehlabathebe National Park in the south-east, protected as a wildlife sanctuary and national park since 1970 and gazetted in 2001, covers 6,500 hectares; UNESCO added it to the Maloti-Drakensberg World Heritage property in 2013. It shelters the bearded vulture and the Cape vulture, mountain reedbuck and leopard, and the Maloti minnow, a critically endangered fish that UNESCO's statement describes as found only in the park and the Lesotho Highlands Development Authority places throughout the Lesotho highlands. When Katse Dam was filled, plants were rescued from the flooded valley and moved to the Katse Botanical Garden, which covers 17 hectares beside the reservoir.

How erosion and settlement use the land

Only about a tenth of Lesotho is arable: Britannica gives one-tenth, Wikipedia's geography article 10.71% with 0.13% under permanent crops. The best farmland is in the northern and central lowlands and the foothills. The richest land the Basotho once farmed, north and west of the Caledon, has been in the Free State since the wars of the 1860s, and the history article tells that story. What remains is under heavy pressure. Wikipedia's article on the country cites an estimate of 40 million tons of soil lost to erosion each year, and the BTI's 2026 report cites a finding that more than 50% of the country's wetlands have been lost since 2017.

Settlement follows the belts. Britannica describes rural villages ranging from one large family to four or five extended families, with an average of 30 to 50 nuclear families, set on the plains among aloes and trees below the highlands. About three-quarters of the population is rural. The country is divided into ten districts, each with a camptown as its capital, and these into 80 constituencies and 129 local community councils. The water project has reshaped parts of the highlands: Wikipedia's account of it records hundreds of kilometres of paved road built to reach the construction sites, and the Development Authority estimates that the Polihali works in Mokhotlong district will require about 270 households to move.