In Senegal, there is a lake bright pink color. As if it poured potassium permanganate. The water here before salty that it can survive in only one type of micro-organisms - they give a color. All day, standing up to his neck in water, local residents derive from the lake bottom salt and pour it into the boat. Backbreaking labor, but by African standards he paid decently.
Source:
mirfactov.com/