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
flagRepublic of Ireland
41%
52%
0%
5%
17
flagthe United States
13%
48%
7%
29%
68
flagGreece
33%
38%
11%
16%
18
flagGermany
22%
35%
12%
29%
144
flagPoland
19%
32%
12%
34%
2140
flagIndia
20%
29%
29%
17%
34
flagAustria
28%
28%
16%
28%
25
flagAustralia
0%
25%
0%
75%
16
flagthe United Kingdom
16%
24%
16%
43%
37