1. Karachay Lake, Russia
After being used as a dumping site for radioactive waste for decades, Lake Karachay, located in the southern Ural mountains in western Russia, has become one of the most polluted spot in the world. Spending just five minutes near the lake is enough to receive a deadly radioactive dosis, while spending an hour there will probably kill you within the next few hours. In 1968, during drought conditions, the wind carried radioactive dust away from the lake’s dried area, irradiating half a million people. The radiation was comparable to the effect of the atomic bomb dropped on Hiroshima. Another 7,000 people who lived in the area were relocated.
2. Lake Rakshastal, Tibet
Lake Rakshastal is a saltwater lake in Tibet, lying close to the west of Lake Manasarovar. Named “lake of the demon”, Lake Rakshastal produces no waterweeds or fish and the locals consider it poisonous. It is considered to be the home of the ten-headed demon king of Lanka in Hindu myth. Lake Manasarovar, shaped like the sun, is regarded as ‘brightness’ in Buddhism, while Lake Rakshastal, shaped as a crescent, represents ‘darkness’. However, despite its notoriety, the lake bears no less beauty than other Tibetan lakes
3. Boiling lake, Dominica
Boiling lake in Dominica is actually a flooded fumarole (a crack through which gases from molten lava escape), filled with superheated bubbling water that is enveloped in a cloud of vapor. Since the lake is the second largest hot spring on Earth with the water temperature of 82-91.5 Celsius (180-197 Fahrenheit) measured just at the edges, not only it would be uncomfortable to swim in, it would kill you if you even got near it. So far, scientists haven’t measured the temperature in the center of the lake where the water actually boils.
4. Lake Monoun, Cameroon
Lake Monoun, that lies in the Oku Volcanic Field in Cameroon, is the first of only three known cases of lake overturn. In 1984, the lake exploded in a limnic eruption and released a cloud of deadly carbon dioxide gas that killed 37 people. A truck carrying twelve people was in the path of the gas and when the engine suddenly stopped working, the people got out of the truck to see what was wrong and were all killed. The only survivers in this accident were two persons riding on the top of the truck as they were above the gas and could still breathe. Two years later a similar event occurred at Lake Nyos, about 100 km away.