North America or Europe.
Lake tohoe is the cleanest followed by smith lake in Alabama
rain water
Canada.
Water from a UV filter is not at all dirty. Boiled water is actually the cleanest water.
Hydrogen. The combustion product is water.
The drinking water in Antarctica is either melted blue ice -- i.e., no other minerals except oxygen and hydrogen, or desalinated sea water. It is the most delicious water ever tasted, some would say. 'Cleanest' means nothing else in the water, and under this definition, any desalinated sea water or melted blue ice would qualify as cleanest.
Switzerland has the best drinking water. Switzerland's percentage is 95.5.
Scotland has some of the cleanest water in the world! The tap water is very safe to drink.
its not Africa so it must be either America or Europe probably in austrilia actually try Google
If by water system you mean a river system, then the Amazon River system of South America is the largest.
Cleanest.