Which of these lakes is considered the most toxic in the world?

Aral Sea
Lake Karachay
Lake Rainier
Lake Czebarkul
Lake Karachay is a small lake in central Russia. It is often referred to as the most polluted site on earth. Containing just one square mile of water, the lake formed a dumping ground for nuclear waste by for around 12 years.High level radioactive waste makes up almost the entire lake-bed to a depth of around 3.4 meters. Some areas surrounding the lake have radiation measurements of around 6 Sv/hour, which is enough to give a lethal dose to a human in as little as 30 minutes¹.
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Answers by country

Aral Sea
Lake Karachay
Lake Rainier
Lake Czebarkul
answers
flagGermany
16%
52%
12%
20%
25
flagIndia
16%
50%
8%
16%
12
flagthe United States
23%
38%
0%
33%
21
flagPoland
19%
29%
13%
36%
1091
flagthe United Kingdom
23%
29%
11%
35%
17