The warm waters are rich in minerals like silica and sulfur and bathing in the Blue Lagoon is reputed to help many people suffering from skin diseases such as psoriasis. The water temperature in the bathing and swimming area of the lagoon averages 40 °C (104 °F).
The lagoon is fed by the water output of a nearby geothermal power plant. 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 hot water heating system. Then the water is fed into the lagoon for recreational and medicinal users to bathe in.
The spa is located in a lava field in Grindavík on the Reykjanes Peninsula, southwestern Iceland. It is situated approximately 13 km from the Keflavík International Airport and 39 km from the capital city of Reykjavík.
The complex is in the process of undergoing a refurbishment and a new restaurant is due to be completed soon. The changing room facilities were completed in early 2007 and can now accomodate more guests than before. Iceland has a strict code of hygiene and guests are required to shower nude in the communal shower areas before and after bathing. Please see the External links section.
The Blue Lagoon has been used by various TV shows and movies including The Amazing Race 6, Top Gear and Hostel 2.