Kaieteur Falls is a 226-metre (741 ft) single-drop waterfall on the Potaro River in Kaieteur National Park, in Guyana's Potaro-Siparuni region. After the main plunge over a cliff of sandstone and conglomerate, the river falls through a series of steep cascades that bring the total height to 251 m (822 ft), and with an average flow of about 663 m³/s it ranks with the world's most powerful falls. It is about four and a half times the height of Niagara Falls and about twice that of Victoria Falls. The cliff is the edge of the Pakaraima plateau, built from sandstones laid down well over a billion years ago on the Guiana Shield. The falls lie in the area west of the Essequibo River that Guyana administers and Venezuela claims.
Few waterfalls show their geology so plainly. Explaining why the Potaro drops so far in one leap means starting at the bottom of the rock pile and working upward, from the ancient basement to the sandstone cap, then to the uplift and erosion that exposed the cliff, and finally to the forest, frogs and minerals that the landscape now holds.
The Guiana Shield Basement Beneath the Potaro
Under Kaieteur lies the Guiana Shield, one of the three cratons, or ancient stable blocks, of the South American Plate. It underlies Guyana, Suriname and French Guiana, much of southern Venezuela, most of Brazil north of the Amazon, and parts of eastern Colombia, and it is usually described as a Precambrian formation about 1.7 billion years old. Its oldest rocks are the Archean Imataca Complex of quartz-feldspar and mafic gneisses. South of the Guri Fault come Early Proterozoic volcanic and granitic rocks, the Pastora Supergroup and the Supamo Complex.
These crystalline rocks are the floor on which everything at Kaieteur rests. Across the shield they consist of metasediments and metavolcanic greenstones, overlain by nearly flat layers of sandstone, quartzite, shale and conglomerate. Those upper layers were later intruded by sills of younger mafic rock such as gabbro, sheets of once-molten rock squeezed between the sedimentary beds.
Roraima Group Sandstones: 1.8 to 1.4 Billion Years of Sediment
On top of the basement sits the Roraima Group, the rock that forms the Kaieteur cliff and the table mountains of the region. It is a thick pile of continental sedimentary rock: quartz sandstones, quartzites and conglomerates, presumed to be between about 1.8 and 1.4 billion years old. The layers lie nearly horizontal, which is why the plateaus they form are so flat-topped and their edges so sheer.
Quartz sandstone of this kind is extremely resistant, because quartz grains barely dissolve or decay. Where rivers run off the plateau, they cannot easily wear the hard cap down into a gentle slope, so the edge stays vertical and the water falls clear. The plunge at Kaieteur is over exactly this rock, a cliff of sandstone and conglomerate.
Gondwana's Break-Up and the Rise of the Pakaraima Mountains
The region is part of the remnants of Gondwana, the southern landmass whose pieces include South America, Africa, Antarctica, Australia, Zealandia, Arabia and the Indian subcontinent. Gondwana started to fragment in the Early Jurassic, around 180 million years ago. The region's great sandstone plateau, which once covered the granite basement between the Amazon and the Orinoco, began to erode and break up about 300 million years ago, and by about 70 million years ago only isolated blocks remained. These blocks are the tepuis, a Pemon word meaning "house of the gods".
The Pakaraima Mountains are a sandstone plateau underlain by horizontal Precambrian marine strata that rose after the Cretaceous. They run west to east for more than 800 km across south-western Guyana and into Brazil and Venezuela, and form the divide between the Orinoco valley to the north and the Amazon Basin to the south. Their highest point is Mount Roraima, a tepui of 2,810 m surrounded by cliffs 300 m high. Further east, inside Guyana, Mount Ayanganna reaches 2,041 m and is the easternmost tepui taller than 2,000 m.
Numerous rivers rise in these mountains and fall steeply on their way down to the lowlands. The Guiana Highlands, the higher ground of the shield, are the source of several of the world's best-known waterfalls, including Angel Falls and Cuquenan Falls in Venezuela and Kaieteur in Guyana, and the headwaters of the Mazaruni and Ireng rivers also lie in the Pakaraimas.
The Potaro River's 255 km From Mount Ayanganna to the Essequibo
The Potaro rises near Mount Ayanganna in the Pakaraima Mountains and runs about 255 km to join the Essequibo, Guyana's largest river. Upstream of the falls, the Potaro Plateau stretches away to the distant Pakaraima escarpment; Menzies Landing, a 20-minute walk upriver from the lip of the falls, is the staging point for boat travel farther upstream.
At Kaieteur the river reaches the edge of a sandstone step and drops into the gorge it has cut. Nine waterfalls interrupt the Potaro's course in total. Below Kaieteur come Amatuk Falls and Waratuk Falls, and farther downstream Tumatumari Falls; the village of Tumatumari lies about 15 km above the Essequibo confluence. Boats can travel up the river only as far as Potaro Landing, where the Denham Suspension Bridge opened in 1933 to shorten the route to the interior goldfields; in 2012 the landing and its surroundings had 112 residents.
Measuring the 226-Metre Plunge Since Barrington Brown's 1870 Survey
The falls were long known to the region's Indigenous peoples, including the Patamona, whose traditions connect the name with an old man: one legend tells of a chief who paddled over the falls as a sacrifice to save his people, and the name is usually glossed as "old man fall". The first Westerner to see them was Charles Barrington Brown, a geologist born on Cape Breton Island who had been appointed a government surveyor in British Guiana in April 1870, and who came upon the falls alone later that year. Lacking time to study them, he returned a year later to make proper measurements, and described the region in Canoe and Camp Life in British Guiana (1876).
The figures quoted today are 226 m from the lip to the first break, and 251 m including the cascades. Height alone is not what makes Kaieteur stand out. Angel Falls, which drops off Auyán-tepui in Venezuela, is the world's tallest uninterrupted waterfall at 979 m. What sets Kaieteur apart is the combination of a long single drop with a large volume. Niagara Falls carries more water, an average of about 2,400 m³/s, but its Horseshoe Falls stands only about 57 m high.
Golden Rocket Frogs and Giant Bromeliads in Kaieteur National Park
What the old rocks built is an island of unusual life. Kaieteur National Park lies in the Guianan moist forests ecoregion and is widely regarded as Guyana's only true national park. A Presidential Order in 1999 enlarged it from 10 km² to about 630 km² (242 sq mi), and the Kaieteur National Park Commission administers it under the Kaieteur National Park Act.
Its best-known endemic is the golden rocket frog, Anomaloglossus beebei, found only in the park. It lives on a giant bromeliad, Brocchinia micrantha, laying its eggs and raising its tadpoles in the pools of water held between the plant's leaves, which males defend. Unusually, the females are the brightly coloured sex, golden or orange, while males are a duller tan; this is known as reverse sexual dichromatism. Adults reach a maximum snout–vent length of about 17 mm. The moist plateau around the falls and its frogs featured in David Attenborough's series Life on Earth.
Isolation helps explain the endemism. Tepuis stand as separate blocks rather than connected ranges, and their summit plateaus are cut off from the forest below by cliffs, making them ecological islands where distinctive plants and animals have evolved, though recent studies suggest they are less isolated than once believed. Visitors reach this world mostly by air: Kaieteur International Airport, about a 15-minute walk from the top of the falls, has frequent flights to Ogle Airport and Cheddi Jagan International Airport near Georgetown.
Gold, Diamonds and the Essequibo Basin Below the Falls
The same ancient rocks that built the cliff left mineral wealth downstream. Placer gold has been recovered from the Potaro's stream gravels and weathered rock by the many thousands of ounces, and the two largest gem-quality diamonds found in Guyana, of 56.75 and 25.67 carats, both came from the Potaro area. The mineral potarite is named after the river, where Sir John Burchmore Harrison first found it. Mining pressure reaches the park itself: villagers from Chenapau were arrested for illegal mining inside its boundaries in 2017, and in November 2023 a new dispute led to protests over a buffer zone.
Below the falls, the Potaro's water joins the Essequibo, which rises in the Acarai Mountains near the Brazilian border and flows north for 1,014 km to the Atlantic, entering it 21 km from Georgetown. Its basin covers 156,828 km² and receives an average of 2,174 mm of rain a year, and it holds more than 300 fish species, almost 60 of them endemic. For the record-holder that drops off a tepui in neighbouring Venezuela, see our guide to Angel Falls; for the table mountain at the head of the Pakaraima range, read about Mount Roraima; and to set Kaieteur's volume beside the other giants, see our ranking, most powerful waterfalls in the world.