Rio Tinto
The waters of the river are colored red. This is due to the high concentration of copper and iron and the acidity of the water. For several hundred years, mining has been carried out in the upper reaches of the river, which has led to the pollution of the river. There are no fish in its caustic waters, and no matter how hot it is, you can’t even wet your feet in this reservoir.

Boiling lake
This lake could well become a thermal resort, if not for one thing: the water temperature in the reservoir ranges from 82 to 91.5 ° C. Not only is it not recommended to swim in the lake, but it is even forbidden to come close to it. Due to jets of hot air and lava periodically escaping from the bowels, you can simply boil yourself alive.

Chitarum
The inhabitants of West Java adapted this river for the needs of agriculture, and for water supply, and for industry, and for many other purposes. About five million people live in the river basin, and over the years of using the waters of the reservoir, they have turned it into a real garbage dump. If you take a sample from the river, you can find almost all the elements of the periodic table in it, needless to say, the concentration of most of them is several times higher than the permissible norms.

Kivu
The smooth blue surface of the reservoir is actually deceptive. The lake is a real time bomb: more than 250 km of carbon dioxide and about 65 km of methane are hidden under the water column. The lake is located in a rift valley that gradually grows, causing volcanic activity, which, in turn, can lead to an explosion. As a result of the last volcanic eruption in the district, the water in the reservoir boiled and the fish boiled alive.

Karachay
Since October 1951, liquid radioactive waste began to be buried in a picturesque reservoir in the Chelyabinsk region. Presumably, by now, about 120 million curies of radioactive materials have accumulated in the lake. In 2015, the lake is planned to be completely filled up, but even these measures cannot prevent radioactive contamination of groundwater, which may well serve as one of the sources of food for nearby water bodies.