The Aral Sea, at a glance
A human-made environmental disaster, not a natural one
~90% shrunk
Of its original size lost since the 1960s.
2 feeder rivers
Amu Darya and Syr Darya, diverted for cotton irrigation.
Soviet-era cause
Large-scale irrigation projects built to grow cotton in the desert.
Toxic dust
Exposed, chemical-laced lakebed now a dust-storm source.
How Did the Aral Sea Disappear?
Must KnowFrom Fourth-Largest Lake to Desert
- The Aral Sea has shrunk by roughly 90% of its original size since the 1960s.
- Soviet-era irrigation projects diverted its two main feeder rivers, the Amu Darya and Syr Darya, to grow cotton in the surrounding desert, the same kind of water-rights failure covered in Natural Resources: Distribution and Distributive Justice.
- Among the Aral Sea, the Black Sea, and Lake Baikal, only the Aral Sea has shrunk this catastrophically due to human activity.
Q1. True or False: The Aral Sea has shrunk by roughly 90% of its original size since the 1960s.
Q2. True or False: The Black Sea and Lake Baikal have also shrunk catastrophically, the same way the Aral Sea has.
What the Collapse Left Behind
- As the sea dried up, local fisheries and the communities depending on them collapsed.
- The exposed lakebed, contaminated with agricultural chemicals, became a source of toxic dust storms, a very different kind of desert from the naturally arid Sahara Desert.
- A similar upstream threat, a dam reducing water inflow, now endangers Lake Turkana: The Jade Sea.
Q3. True or False: The Aral Sea’s shrinkage was caused by Soviet-era irrigation projects diverting its feeder rivers to grow cotton.
A Related Record
Good to KnowThe World’s Actual Largest Lake
- The Caspian Sea, not the Aral Sea, is the world’s largest lake by area.
Q4. True or False: The Caspian Sea, not the Aral Sea, is the world’s largest lake by area.
Think it through, before reading on. The Black Sea and Lake Baikal both face serious environmental problems today. Why doesn’t either one count as “shrunk” the way the Aral Sea has?
Show the explanation
Pollution, warming, and biodiversity loss are real problems for the Black Sea and Lake Baikal, but neither has lost most of its physical water surface. The Aral Sea is different: its two main feeder rivers were deliberately diverted away from it, so the lake itself physically dried up and shrank by roughly 90%. Exam-setters group all three together because all three are genuinely troubled water bodies, but only the Aral Sea has actually disappeared.
Remember the trap. Only the Aral Sea has shrunk catastrophically. The Black Sea and Lake Baikal have other problems, not physical shrinkage.
Quick Q&A
By how much has the Aral Sea shrunk since the 1960s?
Roughly 90% of its original size.
What caused the Aral Sea to shrink?
Soviet-era irrigation projects diverting its feeder rivers to grow cotton.
Which two rivers used to feed the Aral Sea?
The Amu Darya and the Syr Darya.
Which lake is actually the world’s largest by area?
The Caspian Sea, not the Aral Sea.
Previous Year Question
PYQWhich Water Body Actually Shrank
- UPSC CSP 2018, GS Paper I — “Which of the following has/have shrunk immensely/dried up in the recent past due to human activities? 1. Aral Sea, 2. Black Sea, 3. Lake Baikal.” Among the Aral Sea, Black Sea, and Lake Baikal, only the Aral Sea has shrunk catastrophically due to human activity. (Correct answer: 1 only.)
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