At the edge of Iran's central desert, in a gorge so narrow you could almost touch both walls, stands a wall of stone that held a world record longer than any structure of its kind in history. The Kurit Dam was built around 1350, in the age of the Mongols, to catch the water of a desert river — and at some sixty metres it was the tallest dam on earth, a title it kept for roughly five hundred and fifty years, until the early twentieth century. No dam anywhere had ever held that record so long. It no longer holds water; part of its face has fallen; a modern dam sits upstream. But the great arch still stands in its canyon, and it still carries a lesson the modern builders had to learn the hard way.
Iran's history of water is written in stone across its deserts — in the underground channels of its qanats, the great weirs of Shushtar, the reservoirs of its arid towns. But one structure stands above all the rest, literally: near the oasis city of Tabas, at the eastern edge of the Dasht-e Kavir, a medieval dam reached a height that no other dam on earth would match for more than five centuries. This is the Kurit Dam (سد کریت), and its story is one of the most astonishing in the history of engineering.
The numbers are what stop you. Built around 1350, during the Ilkhanid — Mongol — period, the dam rose to about sixty metres, and a further four metres added in 1850 brought it to roughly sixty-four. That height made it the tallest dam in the world, and it remained so for approximately 550 years, from the middle of the fourteenth century until the early twentieth. Twenty-one historic dams over fifteen metres survive in Iran — a world record for any country — and of them all, Kurit is the highest and the most remarkable. A former president of the International Commission on Large Dams called it one of the most astounding achievements in dam engineering of the entire Middle Ages.
It was built where it had to be: in a very narrow gorge in the mountains above the village of Kurit, a slot so tight that a tall, thin wall of masonry could bridge it and hold back the flood of the seasonal Kurit River. The form is an arch-gravity dam — curved to throw the water's force into the canyon walls — and, unusually, its downstream face stands nearly vertical while the upstream face leans, a choice driven by the sheer difficulty of building in so confined a space. For some 600 years it regulated the river for the irrigation of Kurit, turning the violence of desert flood into the steady water of survival.
The dam no longer holds a reservoir. A modern dam was raised just upstream in 2005, the old lake behind it has silted up, and a large section of the lower downstream face has fallen away with the centuries. What remains is the towering, weathered arch itself, standing alone in its gorge at the desert's edge — no longer working, but still, six and a half centuries on, one of the great sights of Iranian engineering and part of the UNESCO Tabas Global Geopark.
The Kurit Dam stands in a narrow gorge 42 km south-east of Tabas, near Kurit village, at the edge of the Dasht-e Kavir. The marker is approximate — this is remote desert country. Go from Tabas with local guidance.
What makes Kurit remarkable is not only its height but the intelligence built into it — a set of solutions, six centuries old, that engineers still study today.
Built in a gorge barely wide enough to span, Kurit is an arch-gravity dam — curved so it throws the water's pressure sideways into the solid canyon walls. Choosing so tight a site let a wall just 1.2 m thick at the crest — a thinness it keeps through its whole top twenty metres — reach an extraordinary height and still hold back the flood.
Its most admired feature: a masonry intake tower standing in the reservoir, pierced at many heights with small plugged openings the locals called qofl (قفل) — locks. A keeper climbed down inside the shaft, pulled the plug of wood and cloth at the right level, and the water ran out beneath the dam to the village — while the lowest locks flushed the silt.
The original dam was limestone masonry set in lime mortar. When about four metres were added in 1850, the builders used brick and stone — square bricks some 37 cm across. Two construction campaigns, five centuries apart, stand one atop the other in its fabric.
Unlike a typical gravity dam, Kurit's downstream face is nearly upright and its upstream face leans — the reverse of the usual. The reason was practical: the gorge was so confining that reaching the downstream side to build it was extremely difficult.
Perhaps the greatest testament is what it survived. The dam has no spillway — floods poured straight over its crest, an estimated thousand times in six centuries — and the magnitude-7.8 Tabas earthquake of 1978, which devastated the region, left the old wall standing without serious damage.
Its whole purpose was survival in an arid land: to catch the seasonal Kurit River at the edge of the Dasht-e Kavir and dole its water out to the village and its fields — flood turned to irrigation, at the threshold of the great salt desert.
The most telling thing about the Kurit Dam is not in its stone but in what happened when the modern world tried to improve on it. Overlooking the water wisdom of the past, engineers built a new dam just upstream of the ancient one. And then something remarkable happened: six years after it was closed to fill, the new reservoir stood virtually empty. The inflow of the river had been badly overestimated — there was simply not as much water as the modern calculations had assumed.
The medieval builders, six hundred years earlier, had made no such mistake. They had sized their dam to the river's real behaviour — to the water that actually came, in a land where water is never to be assumed. Working without hydrological records or modern instruments, they had read their desert river more truly than a modern design of 2005 did with all its advantages. The empty modern reservoir became, unintentionally, the final proof of the old engineers' genius.
It is a parable as much as a fact: a reminder that the people who built at the edge of the desert in 1350 understood their world with a precision we are quick to assume only we possess. The Kurit Dam is sometimes called a symbol of sustainability — of building in harmony with a place rather than against it — and the story of the new dam is why. The old wall of stone in the gorge did not just hold a record for height. It held a lesson, and it waited six centuries to deliver it.
The Kurit Dam is a moderate adventure — the reward is not danger but remoteness, the effort of reaching a narrow gorge deep in desert country far from anywhere. Its Legacy, by contrast, is exceptional: a genuine, documented world record held for 550 years, a feat of medieval engineering that still teaches, and the quiet drama of a six-century-old wall standing alone at the threshold of the great salt desert.
You come to it the hard way — out from Tabas across the desert's edge, then up into dry mountains where a seasonal river has cut a gorge so narrow it feels like a corridor. And there, wedged between the two rock walls as if it grew from them, is the dam: a soaring curved wall of ancient stone, weathered gold and grey, far taller than you expect, filling the slot of the canyon from side to side. You stand at its foot and try to take in the fact — that this wall, here, in this emptiness, was for five and a half centuries the tallest dam on the entire planet. Not the tallest in Iran. The tallest anywhere. From the age of the Mongols to the age of the motorcar, nothing humans built to hold water rose higher than this.
And the longer you look, the more the intelligence of it surfaces. The way the arch curves to throw the flood into the rock. The intake tower with its plugged locks, where a keeper once climbed down to send water out beneath the dam to the village. The strange inverted lean of its faces, the mark of builders solving an impossible site with what they had. This was made around 1350 — before the telescope, before the steam engine — by people who had no theory of hydraulics you would recognise, and yet who understood water, and this river, and this desert, well enough to raise a record that stood until living memory. When you learn that a modern dam built just upstream sat empty because its engineers misjudged the very river these medieval builders had read correctly, you feel something close to awe: the past, reaching forward six hundred years, to quietly correct the present.
That is what stays with you. Not a working reservoir — the water is long gone, the face part-fallen, the lake silted to a plain. What stays is the standing of it: a six-and-a-half-century-old wall, still bridging its gorge at the edge of the Kavir, still holding — not water now, but a record it kept longer than any dam in history, and a lesson its makers built into stone. You came to see an old dam in the desert. You leave having stood beneath the tallest thing of its kind the world had, for five hundred years, and understood that the people who raised it saw further than we tend to imagine.
A wall of desert stone raised around 1350 that stayed the tallest dam on earth for five and a half centuries — built by hands that read their river so truly a modern dam, six hundred years later, stood empty beside it.
March to May is the best time — the desert air is mild, the light is clear, and the approach through the Tabas country is at its most forgiving. The ideal window for the long, remote journey to the gorge, before the summer heat closes in.
October and November are the other good window: the fierce heat has broken, skies are clear, and desert travel is comfortable again. A fine time to combine Kurit with the wider Tabas oasis and its geopark.
Desert winters are cold, especially at night, but days can be crisp and clear and the site is visitable with warm clothing. Check conditions, as remote desert tracks can be affected by rare rain.
High summer at the edge of the Dasht-e Kavir is dangerously hot. The heat in this desert country can be extreme and the remote gorge offers little relief — this is the season to stay away. Save Kurit for cooler months.
The wonder is the great arch standing in its gorge, and the record it held. What follows is the planning detail — gear, logistics, and the questions people ask — tucked away so you can open only what you need.
Kurit is remote, and reached from the oasis city of Tabas. Treat the site position as approximate and lean on local knowledge.
At the edge of the Dasht-e Kavir, 42 km south-east of Tabas in South Khorasan Province, eastern Iran, near the village of Kurit. Tabas — an oasis town and UNESCO Global Geopark — is the base. The dam sits in a narrow gorge in the mountains above the village; the approach is by road toward Kurit and then on foot, and a local guide and a capable vehicle are a great help in this remote desert country.
Because for roughly 550 years — from around 1350 until the early twentieth century — it was the tallest dam in the world. At about 60 m in its original form (later raised to about 64 m), with a crest just 1.2 m thick, this medieval arch-gravity dam held a record no other dam approached for five and a half centuries, and a former president of ICOLD called it one of the most astounding achievements in dam engineering of the Middle Ages. It regulated the Kurit River for irrigation for some 600 years and remains a symbol of Iranian water wisdom.
It was built around 1350, during the Ilkhanid (Mongol) period, in a narrow mountain gorge to store and regulate the Kurit River. Originally about 60 m tall, of limestone masonry set in lime mortar, it had about 4 m added in 1850 (the Qajar era) using brick and stone, bringing it to about 64 m. Its builders also devised a sophisticated system of outlets at different levels to draw water and flush sediment — remarkably advanced for its time.
No. The Kurit Dam no longer impounds a reservoir. A modern dam was built just upstream in 2005, and a large section of the lower downstream face of the historic dam has since fallen away; the old reservoir has largely silted up. What remains is the towering, weathered arch of the ancient dam itself, standing in its narrow gorge — a monument to marvel at rather than a working reservoir.
It is the dam's most telling tale. When engineers built a modern dam just upstream, it stood virtually empty for years after impoundment — the river's inflow had been badly overestimated. The medieval builders, six centuries earlier, had sized their dam to the river's real behaviour; the modern planners had not. The episode became a striking illustration of the 'water wisdom' of the old engineers, who understood their river better than their successors did 600 years later.
Autumn to spring (roughly October to April). Tabas sits at the edge of the central desert and summers are ferociously hot, so the cooler months are far safer and more comfortable; spring is especially good. Avoid high summer, when desert heat becomes dangerous. Whenever you go, carry plenty of water, start early, and treat the desert and remote gorge with respect.
The dam lies within the UNESCO Tabas Global Geopark, a landscape of extraordinary desert geology. The oasis city of Tabas, with its historic Golshan Garden, is the regional highlight, and the surrounding deserts of the Dasht-e Kavir are among Iran's most striking. It is desert country, so distances are large; a visit to Kurit is best combined with a wider exploration of the Tabas oasis and its geopark.
The Kurit Dam is the tallest chapter in one of this collection's deepest stories: the Iranian genius for water, worked out over millennia in one of the world's driest lands. It stands in the same lineage as the underground channels of the Qanat of Gonabad, which carried water tens of kilometres beneath the desert; the vast hydraulic system of Shushtar, where the Sasanians turned a river into power and irrigation; and the desert aqueduct of Kariz-e Kish. Kurit's contribution to that tradition is height — a wall that held back the flood higher than any other on earth for five centuries — and a lesson in reading a river truly. Reached from the oasis of Tabas, it also opens onto one of Iran's great desert landscapes. Come for the record; discover the civilisation that set it.
The underground counterpart to Kurit's wall: a UNESCO-listed qanat, among the oldest and deepest in Iran, that moved water tens of kilometres beneath the desert by gravity alone — the same water wisdom, driven downward instead of up. Read the article →
The grandest of Iran's waterworks: a Sasanian UNESCO complex of dams, canals, tunnels and mills that bent a whole river to human use — the imperial scale of the tradition Kurit belongs to. Read the article →
An ancient underground aqueduct beneath a desert island, carved into coral rock to gather water — another face of Iran's long ingenuity in wringing life from the driest places. Read the article →
The oasis city that is the gateway to the dam — a green pause at the desert's edge with its historic Golshan Garden, and the centre of a UNESCO Global Geopark of extraordinary desert geology.
Come in spring or autumn, from Tabas, with a guide and a vehicle that can take the desert tracks, and make the journey out to the gorge. Stand at the foot of the great curved wall where it bridges the narrows, and hold the fact in your mind: that this, here, at the edge of the salt desert, was for five and a half centuries the tallest dam on earth — raised around 1350 by builders who read their river so well that a modern dam, six hundred years later, sat empty beside it. The water is gone and the face is falling, but the wall still stands, and the lesson still holds. In a land that has always had to be clever about water, the Kurit Dam is the moment that cleverness reached highest — and waited six centuries to prove it right.
Untamed Iran prefers official, scientific and first-hand sources, and is careful to separate what is established from what is reported. The Kurit Dam is unusually well documented for a remote site, with a peer-reviewed engineering paper and international dam-commission records; this page rests on those, cross-checked, with figures that vary between sources flagged. The following are the sources this page draws on:
Facts last reviewed July 2026. Established: a historic masonry arch-gravity dam 42 km south-east of Tabas (South Khorasan) at the edge of the Dasht-e Kavir, near Kurit village; built around 1350 in the Ilkhanid era and raised by ~4 m in 1850; that it was the tallest dam in the world for approximately 550 years, from its construction until the early twentieth century (attested by a peer-reviewed paper and international dam-commission sources); its arch-gravity form, multi-level outlet system, and stone-and-lime (later brick) construction; ~600 years regulating the Kurit River; the modern upstream dam (2005); the partial collapse of the lower downstream face and silting of the reservoir; and its place within the UNESCO Tabas Global Geopark. Reported / variable between sources: the height is given as ~60 m (original) to ~64 m (after the 1850 raising); crest length as ~50 m; the crest thickness is 1.2 m (given as 120–125 cm, constant through the top ~20 m, thickening to ~10 m at the riverbed) — texts printing “2.1” reflect a reversed Persian decimal; the distance from Tabas is stated here as 42 km (ICID) though some sources give other figures; and the exact construction date is placed “around 1350.” Approximate: the coordinates (the marker gives the area in remote desert country, not a surveyed point). Framed with care: the “tallest in the world” claim is stated for the period ~1350 to the early twentieth century, as the sources do, not as an all-time record.