Blue Lagoon T= 38°C, Iceland

Location: 40 km from Reyljavik and 20 min from Keflavik international airport.
bluelagoon@bluelagoon.is.    www.bluelagoon.com.
Facilities: natural depression in lava field filled with geothermal water coming from the deep water wells. Spa complex open all-year round.
Description: The Blue Lagoon was formed in 1976 during operation at the nearby geothermal power plant. The geothermal water originates 2,000 metres below the surface, where freshwater and seawater combine at extreme temperatures. It is then harnessed via drilling holes at a nearby geothermal power plant, Svartsengi, to create electricity and hot water for nearby communities. On its way to the surface, the water picks up silica and minerals, before emerging at a soothing 38°C (100°F). The geothermal water has a unique composition, featuring three active ingredients – Silica, Algae and Minerals. The blue colour comes from the silica and the way it reflects sunlight. During summer there can also be a hint of green in the water. This is the result of the algae, which multiplies quickly when exposed to direct sunlight. However, the water is actually white. If you pour it into a transparent cup, it will always have a milky white colour. The sun simply makes it look blue! The lagoon contains 9 million litres of water. The water is self-cleansing – it renews itself every 40 hours. Blue Lagoon is mostly ca. 0.8-1.2 metres deep. Its deepest point is 1.6 meters. In the years that followed, people began to bathe in the unique water and apply the silica mud to their skin. Those with psoriasis noticed an incredible improvement in their condition.
Water type: sodium-clorine with silica 251 mg/kg. Mineralization is 25.8 g/kg.