BLUE LAGOON (geothermal spa) - Iceland's top tourist attraction
The Blue Lagoon is a geothermal spa in southwestern Iceland. The spa is located in a lava field near Grindavík on the Reykjanes Peninsula, in a location favourable for geothermal power, and is supplied by water used in the nearby Svartsengi geothermal power station. The Blue Lagoon is approximately 20 km (12 mi) from Keflavík International Airport, and is one of the most visited attractions in Iceland.
The water's milky blue shade is due to its high silica content. The silica forms soft white mud on the bottom of the lake which bathers rub on themselves. The water is also rich in salts and algae.
The water temperature in the bathing and swimming area of the lagoon averages 37–39 °C (99–102 °F).