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
flagthe United States
11%
52%
7%
26%
53
flagGermany
23%
38%
11%
26%
88
flagGreece
33%
38%
11%
16%
18
flagIndia
12%
33%
29%
20%
24
flagAustria
13%
33%
20%
33%
15
flagRepublic of Ireland
58%
33%
0%
8%
12
flagPoland
20%
30%
12%
35%
1777
flagthe United Kingdom
18%
28%
12%
40%
32
flagAustralia
0%
25%
0%
75%
16