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| Aral Sea basin | |
|---|---|
| Name | Aral Sea basin |
| Caption | Satellite view of the northern and southern remnants, 2010 |
| Location | Central Asia |
| Inflow | Amu Darya; Syr Darya; numerous tributaries |
| Basin countries | Kazakhstan; Uzbekistan; Turkmenistan; Tajikistan; Kyrgyzstan |
| Area | Variable (historically ~68,000 km²) |
| Settlements | Nukus; Aralsk; Muynak; Kyzylorda; Baikonur |
Aral Sea basin is the endorheic drainage basin occupying parts of Central Asia that historically fed the large inland lake between the Ural River/Caspian corridor and the Himalayas foothills. The basin centers on the confluence and catchments of the Amu Darya and Syr Darya rivers and spans countries formed from the dissolution of the Soviet Union, principally Kazakhstan and Uzbekistan, with portions in Turkmenistan, Tajikistan, and Kyrgyzstan. Historically linked to the Silk Road corridors and Soviet water development projects, the basin has been the focus of international environmental, geopolitical and engineering attention.
The basin lies in continental interiors bounded by the Tien Shan, Pamirs, and Kopet Dag ranges and drains into a terminal lake system that historically included the North and South basins of the Aral Sea near the Amu Darya delta and Syr Darya delta. Major tributaries include the Vakhsh River, Zeravshan River, Kafirnigan River, and smaller streams such as the Chu River; irrigation diversions originate from Soviet-era projects like the Great Ferghana Canal and river-engineering works tied to the Virgin Lands Campaign. The basin’s endorheic nature means evaporation in the Kyzyl Kum and Karagiye Depression controls surface water balance; groundwater systems interact with alluvial aquifers beneath oases such as Khiva and Bukhara.
Human alteration accelerated during the Russian Empire’s expansion and intensified under the Soviet Union’s agricultural policies, particularly cotton monoculture driven by planners in Moscow and ministries such as Gosplan. Large-scale irrigation barrages, dams like the Toktogul Reservoir and diversion canals were constructed to supply cotton and cereal production for centers including Tashkent and Almaty. Soviet engineers, scientists from institutions like the Russian Academy of Sciences and local republic academies, and projects associated with the Central Asian Hydrometeorological Institute reshaped river courses, altering delivery to the terminal lake.
Widespread abstraction resulted in dramatic retreat of lake waters starting in the mid-20th century, producing exposed seabeds, saline dust storms, and the division of the lake into separate basins. International attention focused on desiccation, highlighted in reports from organizations such as the United Nations Environment Programme, World Bank, and UNESCO. Consequences include contamination linked to agrochemicals used in Soviet campaigns, residue from DDT and organophosphates, and salinization of soils documented by researchers at universities like Columbia University and University of Oxford.
Port cities such as Aralsk and Muynak experienced fisheries collapse, unemployment, and migration; livelihoods shifted from commercial fishing to pastoralism or outmigration toward regional hubs like Nur-Sultan (formerly Astana) and Samarkand. Public health studies by agencies including the World Health Organization and national ministries reported elevated rates of respiratory disease, anemia, and cancers in communities exposed to windblown salt and agrochemical aerosols. The loss of navigable waters affected commerce along routes linked to the Silk Road heritage and regional transport networks serving oil and gas corridors.
Restoration and mitigation have combined engineering, political negotiation, and international finance. The construction of the Kokaral Dam on the northern remnant improved water levels in the Syr Darya-fed section, an initiative supported by the Kazakhstani government and international donors including the World Bank. Basin-scale governance involves multilateral bodies such as the International Fund for Saving the Aral Sea and interstate agreements among Central Asian republics negotiated in forums like the Shanghai Cooperation Organisation and the 5+1 Uzbekistan Initiative. Projects include afforestation campaigns using species trialed by the Food and Agriculture Organization and pilot desalination and wastewater reuse schemes promoted by development banks.
The basin once supported endemic fish communities in the terminal lake and wetlands, migratory bird flyways used by species documented by institutions like the RSPB and regional ornithological societies, and reed and riparian vegetation around deltas such as reed beds near Muynak. Desiccation caused local extinctions and ecosystem regime shifts, affecting fauna studied by biologists at the Zoological Institute of the Russian Academy of Sciences and conservationists from BirdLife International. Remaining wetlands, including those in the Northern Aral Sea basin, host recolonization by species linked to the Amu Darya Delta Biosphere Reserve and Ramsar-listed sites.
Large-scale water loss altered regional microclimates, increasing continentality with hotter summers and colder winters in nearby plains, effects modeled by climate groups at NASA and the Intergovernmental Panel on Climate Change. Changes in evapotranspiration and albedo influenced dust transport along corridors toward the Caspian Sea and Persian Gulf air masses, with downstream implications for irrigation networks in Khorezm and water allocation disputes mediated in institutions like the International Centre for Water Resources and Global Change.
Category:Drainage basins of Asia Category:Environment of Central Asia