The Blue Lagoon is Icelandâ??s most famous attraction. A pool of superheated neon blue water, it is believed to have restorative effects and is visited by over 400,000 people each year. The water in the Lagoon gets its color from the rich mineral, silica and sulfur content and it steams because, well, itâ??s really hot. The lagoon is a man-made lagoon which is fed by the water output of the nearby geothermal power plant Svartsengi and is renewed every two days. Superheated water is vented from the ground near a lava flow and used to run turbines that generate electricity. After going through the turbines, the steam and hot water passes through a heat exchanger to provide heat for a municipal water heating system. Then the water is fed into the lagoon for recreational and medicinal users to bathe in.   the water is a blend of many healthy minerals that are beneficial for human body. It contains 251 mg of silica, 7.643 mg sodium, 1.177 mg potassium, 1.274 mg of calcium, 11.4 mg of carbon dioxide, 0.60 mg of magnesium, 15.740 mg of chlorine, 31.8 mg of sulfate, and 0.18mg of fluorine. The water temperature averages about 39° C (102 degrees Fahrenheit),