Blue Lagoon Spa (Interesting World, Places)
In 1976 a pool formed at the site from the waste water of the geothermal power plant that had just been built there. In 1981 people started bathing in it after its purported healing powers were popularized. In 1992 the Blue Lagoon Company was established and the bathing facility was opened for the public.
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.