Water temperatures can get boiling hot here, with recorded temperatures hovering around 140 degrees Fahrenheit. Its blood red color is due to the high levels of bacteria that inhabit it. Lake Natron in northern Tanzania gives the appearance of a beautiful lake. If turning to stone sounds like something so impossible that it only belongs in a science fiction novel or a Game of Thrones episode, think again. Lake Baikal lines with resorts and towns catering to those who want to get out on the water, making it a perfect destination for anyone looking to swim in and relax along the shores of the “Pearl of Siberia.” Lake Natron, Tanzania Not only is this Russian lake safe to swim in but it also boasts some of the most pure water in the world. Swim Here Instead: Set in southeastern Siberia, you will find the oldest and deepest lake in the world, Lake Baikal. Even just standing on shore can be deadly: If a human were to hang out on Lake Karachay for an hour, they would be exposed to a lethal dose of radiation. The nuclear waste storage and processing facility has been dumping nuclear material into the area’s lakes and rivers for decades. Lake Karachay can thank the neighboring Mayak Production Association for its deadliness. In fact, it’s so polluted that the lake is radioactive. Set in the Ural Mountains in Russia, Lake Karachay is often deemed the most polluted place on Earth. “wild swimming” scene and a fantastic spot for anyone wanting to try the natural swimming experience. The spring fed quarry lake boasts crystal clear waters and loads of flat rock ledges making for ideal perches for big splashes and dives. Swim Here Instead: If you still want to satisfy an urge to swim in a quarry in the United Kingdom, try the Goldiggins Quarry in Minions, Cornwall.

While you would think no one would want to swim here, the enticing blue color still brings in swimmers who ignore the many warning signs. In addition to harboring toxic chemicals from the surrounding rocks, the body of water boasts trash, dead animals, and excrement.

With a pH level of 11.3, the Blue Lagoon is on a similar pH level to bleach and ammonia.

The quarry was flooded with its surrounding limestone rocks giving the water a pretty blue color. However, swimming in the infamous Blue Lagoon is akin to taking a dip in a giant vat of bleach! The Blue Lagoon came into being as the old Far Hill Quarry was closed. With a name like “The Blue Lagoon” you would think this is the spot to go for a swim while in Buxton, Derbyshire.

Deadly lake natron facts