Pustoye Lake, Siberia
Lake Pustoye in Siberia looks quite beautiful and idyllic. However, you should absolutely not go swimming in this lake. Why? Well, the exact reason remains a mystery, but scientists have attempted to bring life forms such as plants and fish to the lake, and none have survived yet. That makes us think that swimming in these waters is probably not the best idea.
Mumbai, India
You can find some of the world’s most gorgeous beaches in Mumbai, India. However, these beaches are often also very toxic, due to uncontrolled industrialization. People have dumped an astonishing amount of waste in the water, which has led to this problem. These waters should definitely be avoided in terms of swimming.