it is up to 97.5% salt water swimming area is fresh water is only about 2.5%, 2.5%, and fresh water is frozen in this North Pole-South Pole and 68.9% of water on the mountain that is located in the basement and 30.8% of the river and the Lake, also known as water on the surface, there is only 0.3%, throughout the period of economic expansion and the growth of population in various countries to make use of multiple water needs.