Aral Sea: Environmental History, Soviet Irrigation and the Changing Landscape of Karakalpakstan

In 1960 the Aral Sea covered some 67,500 square kilometres of desert between Kazakhstan and Uzbekistan. By the summer of 2014 its broad eastern basin had dried out entirely, and much of the old seabed off the coast of Karakalpakstan had become salt flat and sand. How did a lake fed by two of Central Asia’s great rivers come to lose so much of its water, and what does the landscape left behind reveal about the region’s history? On Day 3 of our small group Stans tour through Uzbekistan, Turkmenistan, Kyrgyzstan and Kazakhstan, the group drives from Nukus across the Ustyurt Plateau to spend a night on its shore.

Why the Aral Sea matters in Central Asian history

The Aral Sea is not simply a lake that shrank. It is the end point of a water system on which settlement in the region has long depended, and its story ties together mountains, rivers, oases, empires and, in the twentieth century, a vast programme of planned irrigated agriculture in the desert. To stand on its shore is to see the downstream consequence of decisions taken hundreds of kilometres away, in the irrigated valleys and in the planning offices of the Soviet Union.

It is also the first major stop on our four-country journey through the Stans. The tour begins in Tashkent and, on its second evening, flies west to Nukus, so that the desert, the delta and the drying sea frame everything that follows: the fortresses of ancient Khorezm, the Silk Road cities of Khiva, Bukhara and Samarkand, and the mountain lakes further east. For the broader picture of the country itself, our introduction to exploring Uzbekistan covers the cities and history that this article leaves aside.

A terminal lake fed by two rivers

The Aral Sea has no outlet. It is a terminal lake, filled by the Amu Darya from the south and the Syr Darya from the east, both of them fed, as NASA’s Earth Observatory puts it, by “snowmelt and precipitation in faraway mountains”. Whatever water reaches the basin either stays in it or evaporates under the desert sun. As long as those two forces, river inflow and evaporation, were roughly in balance, the lake held a large body of brackish water.

The scale was considerable. In a 1988 paper in the journal Science, the geographer Philip Micklin described the Aral as “formerly the world’s fourth largest lake in area”, behind the Caspian Sea, Lake Superior and Lake Victoria, and NASA’s Earth Observatory uses the same ranking. A 2020 review chapter by Micklin and colleagues in the Springer volume Large Asian Lakes in a Changing World gives its condition in 1960: a level of 53.4 metres, an area of 67,499 square kilometres, a volume of 1,089 cubic kilometres and an average salinity of around 10 grams per litre.

The southern shore of that lake belongs to Karakalpakstan, an autonomous republic within Uzbekistan that Britannica locates “southeast and southwest of the Aral Sea”. Its centre is the valley and delta of the Amu Darya; to the east lies the western half of the Kyzylkum Desert, and to the west the stony tableland of the Ustyurt Plateau. The capital, Nukus, stands near the head of the Amu Darya delta and was, in Britannica’s words, “established as a city in 1932”. It is the part of Uzbekistan that borders the lake, and the sea’s retreat has shaped its recent history.

An inland sea that has risen and fallen before

The modern shrinking of the Aral Sea has precedents. Micklin’s 1988 paper notes that marine fossils, shore terraces, archaeological sites and historical records “point to repeated major recessions and advances of the sea during the past 10,000 years”. The Amu Darya in particular has wandered across its lower plain, and Micklin records natural and wartime “diversions of this river westward into lower lying channels and hollows”, which reduced the water reaching the Aral.

Those shifts mattered to the people of the lower Amu Darya, because the river was the basis of life in the oasis of Khorezm. Its farmers had drawn canals off the river since antiquity, and the walled settlements they built on the edge of the irrigated land still stand in the desert between Nukus and Khiva. Our article on the desert fortresses of ancient Khorezm explores that archaeology. The point here is simpler: irrigation in this region is ancient, and the Aral Sea has always depended on how much water the people upstream chose, or were able, to take.

What changed in the twentieth century was the scale. Earlier fluctuations followed shifts in the rivers’ courses and the fortunes of the oases along them. The decline that began in the 1960s was the product of deliberate, centrally planned irrigation expansion across both river basins within a few decades.

Soviet irrigation and the expansion of cotton

Soviet planners made cotton a strategic priority. A diagnostic study prepared for the United Nations Environment Programme in the early 1990s records that Central Asia and southern Kazakhstan produced “90% of the cotton” manufactured in the former Soviet Union, and that cotton made up 51 percent of the crops on the basin’s irrigated land. NASA’s Earth Observatory summarises the policy plainly: in the 1960s the Soviet Union undertook a major water diversion project, and the rivers that had fed the lake “were used to transform the desert into farms for cotton and other crops”.

The consequences were foreseen. Micklin’s 1988 paper notes that during planning for a major expansion of irrigation in the basin, conducted in the 1950s and 1960s, experts predicted that inflow to the sea would fall. The expansion went ahead regardless. According to the 2020 review, the irrigated area of the basin grew from around 5 million hectares in 1960 to 8.2 million by 2010, and irrigation came to account for 92 percent of all water withdrawals.

One diversion ran south-west, away from the Aral basin altogether. The Karakum Canal takes water from the Amu Darya across the Karakum Desert of Turkmenistan. Britannica records that its main section, about 840 kilometres long, was begun in 1954 and completed in 1967, ending at Gökdepe, west of Ashgabat, the Turkmen capital; later extensions carried it to a total length of about 1,400 kilometres. Micklin described the canal in 1988 as “the single most important factor” in the falling inflow to the Aral, with some 225 cubic kilometres diverted into it between 1956 and 1986.

There was, for a time, a proposed remedy on an even larger scale: a plan to divert water from the rivers of western Siberia south into the Aral basin. The 2020 review notes that it would have moved up to 60 cubic kilometres a year, and that the project was halted in 1986.

How the Aral Sea shrank, 1960 to 2014

The decline was steady, measurable and, by the 1980s, impossible to ignore. Micklin’s 1988 paper reported that between 1960 and 1987 the level of the Aral Sea “dropped nearly 13 meters, and its area decreased by 40 percent”. As the water fell, the shallow margins retreated fastest, exposing wide stretches of flat seabed. Micklin noted in 1988 that the fish canneries at Aralsk and Muynak, “formerly ports”, now stood some distance from the shore; the story of one of them is told in our article on Muynak and its receding shoreline.

Between 1987 and 1989, according to the 2020 review, the Aral separated into two water bodies: the Small Aral in the north, fed by the Syr Darya and lying in Kazakhstan, and the much larger South or Large Aral, lying across the Kazakhstan–Uzbekistan border and fed, when it receives anything, by the Amu Darya. NASA’s Earth Observatory describes how the South Aral in turn split into western and eastern lobes, the eastern one much shallower.

As the volume fell, the water that remained grew saltier. The 2020 review reports that by 2004 salinity in the Large Aral had reached 100 to 105 grams per litre, roughly ten times the 1960 figure. NASA’s Earth Observatory, whose satellite series on the lake begins in 2000, records the next stage: large retreats in the eastern lobe between 2005 and 2009, and in 2014 the eastern lobe of the South Aral Sea “completely disappeared”. The Micklin review confirms that “in summer 2014 the Eastern Basin of the Aral entirely dried”. The water that remains still rises and falls with the seasons: NASA notes that levels in summer 2018 “were not as low as they might have been, following a round of seasonal snowmelt in the spring”.

The Aralkum: a desert on the old seabed

The land the water left behind did not simply turn to dry ground. It became a new desert, which the 2020 review notes is “often called simply Aralkum”, the Aral Desert, joining the older Kyzylkum and Karakum on the map of Central Asia. Its surface is a mixture of sand, silt and salt left behind by the retreating water.

That is what made the exposed bed so troublesome. NASA’s Earth Observatory notes that “the blowing dust from the exposed lakebed, contaminated with agricultural chemicals, became a public health hazard”, and that “the salty dust blew off the lakebed and settled onto fields, degrading the soil”. As early as 1988, Micklin cited an estimate that some 43 million tonnes of salt a year were being carried from the dry bottom into the surrounding region, and reported that declining drinking-water quality was cited as the main factor in rising intestinal illness around the lower reaches of both rivers.

The country around the sea is therefore a mixture of the very old and the very new: the ancient tableland of the Ustyurt Plateau to the west, and on the old seabed a desert younger than many of the people who live beside it.

Fish, wetlands and the tugai forests of the Amu Darya delta

The sea’s retreat was an ecological collapse as well as a physical one. Before the decline the Aral supported a commercial fishery that Micklin’s 1988 paper puts at 48,000 tonnes in 1957. By the early 1980s, as salinity rose, that paper reports that “20 of 24 native fish species disappeared” and the commercial catch fell to zero. The 2020 review notes that only a few fish, among them the nine-spined stickleback, gobies, atherine and Baltic herring, remained by 1981.

The deltas suffered alongside the sea. As the flow of the Amu Darya fell, the channels, lakes and reed beds of its delta shrank with it. Micklin described the tugai as dense stands of water-loving trees mixed with shrubs and tall grasses fringing the delta arms, and estimated that the expanse of tugai in the Amu Darya delta, about 13,000 square kilometres in the 1950s, “had been halved by 1980”.

What survives has gained international recognition. In 2021 UNESCO’s Man and the Biosphere Programme added the Lower Amudarya State Biosphere Reserve to its World Network of Biosphere Reserves. UNESCO’s listing places it in the northern part of the lower reaches of the Amu Darya, south-east of the former Aral Sea coast, covering 68,718 hectares, and describes its natural vegetation as tugai, “a form of riparian forest or woodland endemic to Central Asia”.

Two seas, two outcomes: the Kok-Aral dam

Once the Aral had split in two, the fates of its two halves diverged. In the north, the Syr Darya still delivered enough water to sustain the Small Aral if it could be kept from draining south into the larger basin. Local authorities in Kazakhstan built an earthen dike across the connecting channel in 1992; the 2020 review records that it was breached and destroyed in 1999. A permanent replacement, the Kok-Aral dam, was built between 2003 and 2005 with support from the World Bank.

The results in the north were striking. The 2020 review reports that the dam “raised and stabilized the level of the Small Aral at near 42 m”. A World Bank release of July 2014 describes the 13-kilometre Kok-Aral Dam as having raised the volume of the Northern Aral Sea by 68 percent by 2008, cut its salinity by half and increased fish production more than threefold. The Small Aral is, however, a fraction of the original lake.

The South Aral, whose southern shores lie in Karakalpakstan, has had no equivalent rescue. Its fate depends on what the Amu Darya delivers after the demands of irrigation upstream, and NASA notes a period when drought “limited and then cut off the flow of the Amu Darya”. In a 2007 review in the Annual Review of Earth and Planetary Sciences, Micklin judged full restoration of the Aral unlikely in the foreseeable future, but saw the protection and rehabilitation of parts of the lake and its deltas as feasible. The title of the 2020 chapter, “a story of devastation and partial recovery”, captures that divided outcome.

Remembering the Aral Sea: archives, reserves and resolutions

The Aral has also become a subject of memory and international attention. In 2011 the Aral Sea Archival Fund in Kazakhstan, a collection of files from 1965 to 1990 that, in the United Nations’ words, “record the ecological tragedy of the Aral Sea”, was inscribed on UNESCO’s Memory of the World Register. Ten years later, on 18 May 2021, the United Nations General Assembly adopted without a vote a resolution declaring the Aral Sea region “a zone of ecological innovations and technologies”.

In Nukus, the story of the region is told in another way. The city is home to the State Museum of Art named after I.V. Savitsky, whose collection is the subject of our article on the Savitsky Museum in Nukus.

The Aral Sea on the Stans itinerary

The tour’s route lets travellers follow the Aral Sea’s chain of cause and effect on the ground: from the irrigated delta around Nukus, across the plateau and old caravan country of the Ustyurt, to the water that remains. The tour page itself puts the shrinking of the sea down to “poorly-planned Soviet-initiated irrigation projects”, and the days spent here, before the Silk Road cities, put that history at the start of the journey.

How long is the drive from Nukus to the Aral Sea?

It is a full day on the road. The tour page describes an early breakfast for a 7:00 am start on a 500-kilometre drive to the shores of the Aral Sea, with stops at Kungrad city and across the Ustyurt Plateau, a boxed lunch, and a planned seaside arrival in the early evening. The tour page describes the plateau as a stony desert plain west of the Amu Darya delta, rich in archaeological sites and once a stopping place for caravans between Khiva and the Volga.

Where does the group spend the night at the Aral Sea?

The group spends one night in a tented camp on the shore. The tour page notes that dinner that evening is eaten outside and that the group sleeps overnight in tents. It does not describe the camp’s facilities, so if you would like to know more about the arrangements, including for solo travellers, a Tour Specialist can talk them through with you.

How physically demanding are the Aral Sea days?

The tour as a whole is rated Level 3, Moderate to Challenging. The tour page states that participants must be in excellent health, extremely mobile and live an active lifestyle, and that activities may include up to six hours of continuous strenuous, moderate to fast-paced activity a day over varied terrain. Day 3 in particular is a long day of road travel followed by a night under canvas, so it is worth discussing the pace with a Tour Specialist. Country-level practicalities are covered in our answers to common questions about travelling in Uzbekistan.

Where does the route go after the Aral Sea?

On Day 4 the group leaves the shore after breakfast, drives for about 1.5 hours to Muynak, has lunch there, and continues to Nukus, with dinner at the hotel. On the morning of Day 5 the tour makes a short visit to the Savitsky Museum before travelling by road to Khiva, which the tour page gives as 180 kilometres and four hours of travel, stopping en route to visit the fortresses of Toprak Kala and Ayaz Kala. From Khiva, the route continues into Turkmenistan.

What the Aral Sea teaches

The Aral Sea is sometimes presented as a simple parable of disaster, but its history is richer and more instructive than that. It shows how completely a terminal lake depends on decisions taken upstream; how an irrigation economy that had sustained Khorezm since antiquity could, when scaled up by central planning, overwhelm the water system it relied on; and how quickly a landscape can change once that balance is lost. It also shows that repair is possible, if only in part, as the Small Aral’s recovery behind the Kok-Aral dam demonstrates.

That is the value of seeing it on the ground. Travelling as a small group of up to 16 travellers with an Odyssey Program Leader, mature travellers reach the Aral Sea within the opening days of the journey, before the oasis cities and mountain landscapes that follow. Seen from the shore after a long day crossing the Ustyurt, the environmental history of Karakalpakstan becomes something you can read in the land itself.