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
14%
46%
6%
30%
62
flagRepublic of Ireland
46%
46%
0%
6%
15
flagGermany
22%
40%
9%
26%
113
flagGreece
33%
38%
11%
16%
18
flagPoland
19%
32%
12%
35%
2028
flagIndia
16%
29%
32%
19%
31
flagAustria
23%
28%
19%
28%
21
flagthe United Kingdom
16%
25%
13%
44%
36
flagAustralia
0%
25%
0%
75%
16