The Aral Crisis: Implications of a Basin That Lost Its Measure for Spatial Planning

Abstract

In 1960 the Aral Sea, with a surface area of about 67,000 km² and a volume of 1,089 km³, was the world's fourth-largest lake. After the waters of the Amu Darya and Syr Darya rivers that feed it were diverted for irrigation, the lake lost more than nine-tenths of its volume within half a century. This article treats the process known as the "Aral crisis" not as a completed disaster but as an ongoing crisis that still depends on decisions. Drawing on a literature and document review, it examines the physical change of the lake, the causes of desiccation, the state of the basin as of 2025–2026, and the water-energy-food-ecosystems (WEFE) nexus between upstream and downstream countries. The pre-1960 water balance shows that about 80 percent of the lake's inflow came from the two rivers, so diverting them for irrigation inevitably broke the balance. The findings show that different decisions in the same basin have produced different outcomes: the Northern Aral has partially recovered thanks to the Kokaral Dam and cooperation within the basin, while most of the Southern Aral has turned into the Aralkum desert. The article draws six implications for spatial planning: taking the basin as the planning unit, basing decisions on a resource inventory, bringing sectoral policies together in a shared spatial framework, monitoring slow-onset problems early, establishing shared institutions and data infrastructure in transboundary basins, and respecting carrying capacity in restoration efforts.

Keywords: Aral crisis, transboundary basin management, WEFE nexus, spatial planning, climate adaptation, Central Asia

1. Introduction

The protection, use and sharing of natural resources is among the most vital issues facing the world. There is an order in the universe that operates from the micro to the macro scale, and humans are the only beings that intervene in it. The Aral Sea is one of the clearest spatial traces of the tension between unlimited human demand and limited resources.

The Aral is a terminal lake in a closed basin, located between Kazakhstan and the Republic of Karakalpakstan in Uzbekistan (Map 1). Its basin covers all of Uzbekistan and Tajikistan and parts of Kazakhstan, Kyrgyzstan, Turkmenistan and Afghanistan (Map 1). The Aral is therefore a transboundary issue that directly affects the water, energy and food security of six countries.

There is a rich literature on the Aral (Micklin, 1988, 2007; Glantz, 1999; Aladin et al., 2009). Most of it, however, lies in hydrology, ecology and water diplomacy. What the Aral experience means for spatial planning has been discussed less. This article aims to contribute to that gap from a planner's perspective.

The article addresses three questions:

1. Which decisions and processes led to the desiccation of the Aral?
2. What is the state of the basin today, and what outcomes have different policies produced?
3. What implications does this experience have for spatial planning at the basin scale?

The Aral is not the agenda of a particular period or of a single international meeting. It is a lasting example of how human intervention can upset the balance of a basin, and one that should be referred to in every debate on climate, water and development.

2. Conceptual framework

2.1. From disaster to crisis: the concept of the "Aral crisis"

The literature often refers to what happened to the Aral as the "Aral Sea disaster" (Micklin, 2007). During his visit to the region in 2010, UN Secretary-General Ban Ki-moon also described the Aral as one of the world's worst environmental disasters. This article, however, uses the term "crisis".

There are two reasons for this choice. The first is continuity: a disaster describes a loss that has already happened, whereas a crisis describes a situation that is still unfolding and must be managed. The second is decision: the word crisis comes from the Greek krisis, meaning separation or judgement. Loss has occurred in the Aral, but the future of the basin depends on decisions made today.

The Aral crisis has four dimensions: ecological (shrinking of the lake, rising salinity, loss of species and wetlands, the emergence of a new desert), economic and social (collapse of fisheries, loss of livelihoods), health (effects of salt and dust storms) and governance (the difficulty riparian states face in forming a common policy).

Glantz (1999) describes the Aral as a typical case of "creeping environmental problems". In this view, decisions that each seem minor accumulate over the years into a disaster, and decision-makers often realise too late that a threshold has been crossed.

2.2. The water-energy-food-ecosystems (WEFE) nexus

The WEFE nexus approach recognises that water, energy, food and ecosystems are both inputs to and outputs of one another. Irrigation needs energy, energy production needs water, and food production depends on both and on healthy ecosystems. A decision in one sector therefore affects the other three.

The three conventions that emerged from the 1992 Rio Conference — the UN Framework Convention on Climate Change, the Convention on Biological Diversity and the Convention to Combat Desertification — are usually handled at separate tables. The Aral, by contrast, is a place where all three problems and all four sectors of the WEFE nexus come together in one basin. The topic is directly linked to the goals of the UN 2030 Agenda (United Nations, 2015) on clean water (SDG 6), sustainable cities (SDG 11), climate action (SDG 13) and life on land (SDG 15).

3. Method

The article is based on a qualitative literature and document review. Sources fall into three groups:

• Peer-reviewed academic publications: for the historical physical change of the lake and the causes of desiccation (Micklin, 1988, 2007; Glantz, 1999; Aladin et al., 2009; Schmeier & Shubber, 2018).
• Institutional reports: for basin governance and regional cooperation, publications of international organisations and think tanks (International Crisis Group, 2014; Öğütcü, 2016; Yıldız, 2014).
• Recent official statements and news: for data from 2024–2026.

Because recent figures rely on statements by the governments concerned, they may require independent verification. Data series from different sources were produced with different methods and should be compared with care. The findings are organised around the research questions and interpreted from a spatial planning perspective.

4. Findings

4.1. Physical change of the lake

The Aral receives about one-fifth of its water from precipitation and the rest from the Amu Darya and Syr Darya rivers, and it maintains its level as long as inflow and evaporation remain in balance (Micklin, 1988). From the 1960s onward this balance broke down, and by the end of the 1980s the lake had split into the Northern (Small) and Southern (Large) Aral (Table 1).

Table 1. Physical characteristics of the Aral Sea in selected years

Source: 1961–2007 Aladin et al. (2009); 2025 Ismailov (2025). The two series rely on different methods.

Between 1961 and 2007 the total volume of the lake fell from about 1,089 km³ to around 100 km³. In the eastern basin of the Southern Aral, salinity exceeded four times that of ocean water (about 35 g/l). The spatial dimension of the change between 1989 and 2008 is shown in Figure 1.

4.2. Water balance of the basin and the lake

According to FAO's broad definition, the Aral Sea basin covers about 1.76 million km²; the table in the same report gives 1.74 million km² (FAO, 2012). Differences between sources stem from whether the surrounding closed sub-basins are included within the basin boundary. This area is about 27 times the lake's pre-1960 surface area.

Precipitation in the basin is highly variable: 80–200 mm/yr in the lowlands and valleys, 300–400 mm/yr in the foothills, 600–800 mm/yr on the southern and south-western mountain slopes, and 800–1,600 mm/yr in the source areas of the Pamir and Tien Shan (FAO, 2012). In other words, water is generated in the mountains and consumed in the plains; the fate of the lake depends on the link between the two — the rivers.

The approximate water balance for the period before 1960, when the lake was largely in equilibrium, is given in Table 2.

Table 2. Approximate annual water balance of the Aral Sea before 1960

Source: FAO (2012). The mm/yr values were calculated by the author based on a lake surface of about 66,000 km². 1 km³ = 1 billion m³.

Table 2 shows clearly what kept the lake in balance. Precipitation falling directly on the lake covered only 9–11 percent of evaporation; about 80 percent of total inflow came from the two rivers. When river water was diverted for irrigation, the balance was therefore bound to break down. These values are historical and cannot be applied directly to today's shrunken lake.

Today, water use in the basin is driven by agriculture. In 2006, 96 km³ of the basin's total withdrawal of 107 km³ — 90 percent — went to irrigation (FAO, 2012). Most permanent consumption is evaporation and transpiration from fields. Of the 28–33 km³ of drainage water returning from irrigation each year, about 30 percent flows into natural depressions where it evaporates (FAO, 2012). By calculation this amounts to about 8–10 km³ a year, roughly one-fifth of the river water that reached the lake before 1960. Part of the water seeping from canals returns to rivers, so not all of it is lost to the basin.

Because these items partly overlap, they cannot be added up into a single "total loss" figure. A reliable current balance requires precipitation, actual evapotranspiration, withdrawals, return flows and storage change for the same year to be assessed together. This requirement also underpins the basin-scale water budget approach proposed in the Discussion.

4.3. Causes of desiccation

From the late 1950s, the Soviet administration diverted the waters of the two rivers into large irrigation canals to expand cotton and rice production. Depending on the period, 25 to 75 percent of this water was lost in canals and in the desert (Micklin, 1988, 2007). Projects drawing large volumes from the Amu Darya, such as the Karakum Canal in Turkmenistan, inefficient irrigation, agricultural pollution and the failure to develop a common water policy after the dissolution of the Soviet Union further accelerated desiccation (Öğütcü, 2016; Yıldız, 2014).

The consequences were multidimensional. Commercial fisheries collapsed, and coastal towns such as Aralsk and Muynak were left tens of kilometres from the shore. The exposed seabed became a new desert, the Aralkum; salt and dust storms rising from it affected farmland and public health. As the moderating effect of the lake weakened, summers in the region became hotter and drier and winters colder (Micklin, 2007).

4.4. Current situation: two paths in one basin

Northern Aral. With World Bank support, Kazakhstan built the Kokaral Dam and completed it in 2005 (Micklin, 2007; World Bank, n.d.). According to official Kazakh data, about 5 billion m³ of water has reached the lake since 2023, raising its volume to 24.1 billion m³. The surface area reached 3,065 km² in February 2025, 22 fish species have returned and the annual catch has risen to about 8,000 tonnes. The second phase, launched in 2025, aims to raise the volume to 35 billion m³ (Ismailov, 2025).

Southern Aral and the Aralkum. Most of the Southern Aral has dried up. To reduce salt and dust storms, Uzbekistan planted saxaul (Haloxylon) on about 1.7 million hectares of the exposed seabed in the five years up to 2024. However, seedling survival falls to about 30 percent in dry years, and experts warn of the new ecosystem's effects on existing species and local land use (Mongabay, 2024).

Today the Northern Aral covers only about 5 percent of the lake's 1961 surface area. The recovery is real, but it does not mean a return to the lake's former state.

4.5. The WEFE nexus and basin governance

Natural resources are unevenly distributed in the basin (Table 3, Figure 2). Upstream countries want to release water from reservoirs in winter to generate electricity, while downstream countries need the same water in summer for irrigation. In the Soviet period this balance was maintained through a centrally managed water-energy exchange (Öğütcü, 2016).

Table 3. Resource and demand characteristics of upstream and downstream countries

Source: Compiled from Öğütcü (2016) and Yıldız (2014).

The largest issue in the nexus today is Tajikistan's Rogun Hydropower Plant on the Vakhsh River. Planned with six 600 MW units, the plant is expected to generate about 14.4 billion kWh a year; the World Bank approved grant support for the project in 2024 and 2026 (Interfax, 2026). Downstream countries have long been concerned about the dam's effects on river flow (Öğütcü, 2016).

Experts project that the basin's annual water deficit could rise to about 20 billion m³ by 2040. Agriculture in the region uses about 3 m³ of water per dollar of value added, twice the global average. According to Uzbek statements, modernising pumping stations has cut the irrigation sector's energy use by about 30 percent (Kun.uz, 2026). This illustrates the logic of the nexus: saving water also saves energy.

The rotating chairmanship of the International Fund for Saving the Aral Sea (IFAS), the basin's main regional institution, passes to Uzbekistan for 2027–2029; Uzbekistan has named strengthening the Fund's institutional and legal framework as a priority (Kun.uz, 2026). The literature stresses that transboundary basin organisations need a strong legal basis to provide an institutional "anchor" for water diplomacy (Schmeier & Shubber, 2018). The potential of water tensions to affect regional stability, particularly in the Fergana Valley, should also be taken into account (International Crisis Group, 2014).

5. Discussion: implications for spatial planning

The findings show that the Aral crisis is rooted less in a technical error than in a problem of measure. The cotton production target was met, but no one asked whether it stayed within the basin's water budget. The recovery of the Northern Aral, on the other hand, proves that nature responds when sound engineering, financing and cooperation within the basin come together. Six implications for spatial planning follow from these two outcomes:

1. The basin is the planning unit. Water does not recognise administrative boundaries. The desiccation of the Aral is the final result of decisions taken across the whole basin. Decisions should be made for the basin as a whole, not by national, provincial or district boundaries.
2. Inventory first, then decision. A balance between supply and demand cannot be set without measuring the basin's water, land and ecosystem capacity. A development plan that exceeds the water budget is not sustainable.
3. Sectors must meet on the same map. As long as water, energy, agriculture and nature policies are written at separate tables, they undermine one another. The spatial plan is the common ground where these policies are reconciled.
4. Slow-onset threats must be seen early. As Glantz (1999) emphasises, the Aral did not dry up overnight. Continuous monitoring and early warning systems prevent seemingly small losses from accumulating.
5. Shared institutions, shared data. Success in transboundary basins depends on riparian states looking at the same data and deciding under a strong institutional umbrella (Schmeier & Shubber, 2018). Even the success of the Northern Aral depends on cooperation with the upper basin.
6. Restoration also needs a measure. Greening the exposed seabed is a valuable effort, but carrying capacity and local livelihoods must be respected when building a new ecosystem.

These implications do not apply to Central Asia alone. Closed basins with rapidly falling groundwater, agricultural regions under drought stress and transboundary river basins may be going through processes similar to the early stages of the Aral. This is what makes the Aral a lasting example.

6. Conclusion

The Aral crisis is one of the clearest examples of how a sectoral target can damage the balance of an entire basin. Within half a century the lake lost more than nine-tenths of its volume, leaving behind a desert, a collapsed livelihood economy and an unresolved governance problem.

Yet the story of the Aral is not only one of loss. The partial recovery of the Northern Aral shows that a crisis is a moment of decision and that the outcome can change with the right decisions. In the same basin, the transformation of the Southern Aral into desert proves that a balance once lost is not easily restored.

The key conclusion for spatial planning is this: demand has no limit, but resources do. Recognising this limit and setting a measure accordingly is not the responsibility of a single individual or institution but the shared responsibility of all communities that share the basin. The plan is the instrument through which this shared measure is brought down to space.

Two areas stand out for future research: developing a spatial planning framework for the Aral basin based on a water budget, and establishing an open spatial data and monitoring infrastructure that riparian states can use jointly.

References

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