The Blue Lagoon geothermal spa and is one of the most visited attractions in Iceland. The steamy waters are part of a lava formation. The spa is located in a lava field in Grindavík on the Reykjanes Peninsula, southwestern Iceland.
The warm waters are rich in minerals like silica and sulfur and bathing in the Blue Lagoon is reputed to help some people suffering from skin diseases such as psoriasis. The water temperature in the bathing and swimming area of the lagoon averages 37-39 °C (98-102 °F).