Located in Russia's south-west Chelyabinsk region, close to the border with Kazakhstan, in the southern Ural mountains, the Karachay Lake it’s considered the most polluted place on Earth.
It was a small lake used as a dumping ground for Chelyabinsk-65, one of the Soviet Union's biggest nuclear weapons facilities between 1951 and 1953. The road to the lake, also known as Karachai or Karachaj, is gravel. Today the lake is completely infilled, full of concrete that’s intended to keep radioactive sediment away from shore.
It’s an extremely dangerous zone. The lake is one of the most deadly bodies of water in the world. It’s so polluted that spending an hour there would kill you. It’d give you a radiation dose of 600 roentgen, more than enough to kill you. It was also affected by a string of accidents and disasters causing the surrounding areas to be highly contaminated with radioactive waste.