The Blue Lagoon is a geothermal spa situated in the southwestern part of Iceland. It's nestled in a lava field just 5 km from Grindavík and right in front of Mount Þorbjörn on the Reykjanes Peninsula, making it a prime spot for geothermal energy. The spa gets its water from the nearby Svartsengi geothermal power station. It's about 20 km away from Keflavik International Airport and is one of Iceland's top tourist destinations.

The water has this cool milky blue color because it’s packed with the silica. This silica creates a soft white mud at the lake's bottom that people like to slather on their skin. Plus, the water is loaded with salts and algae.

The water in the lagoon's bathing and swimming area usually sits between 37 and 39 °C (99 to 102 °F). Before diving into the geothermal spa, guests need to take a shower without any clothes on. The showers are separated by gender. Kids eight and under can only enter if they're wearing arm floaters, which are available for free. Unfortunately, the lagoon isn't safe for little ones under two years old. Wheelchair users can easily access the lagoon thanks to a ramp that leads into the water, plus there's a shower chair available. 

The lagoon was created by humans. The water comes from the nearby Svartsengi geothermal power plant, where superheated water is released from the ground close to a lava flow to power turbines that produce electricity. Once the turbines do their thing, the steam and hot water go through a heat exchanger to supply heat for the local water heating system. After that, the water flows into the lagoon.

The underground geological layers are rich in minerals, and they get pushed up to the surface under a pressure of around 1.2 MPa (12 bar) and a temperature of 240 °C (464 °F) for the power plant's use. Due to the high concentration of minerals, the water can't be recycled and has to be disposed of in the surrounding area, which is a permeable lava field that ranges from 50 to 100 cm (20 to 40 in) thick.

Once the minerals create a deposit, the water seeps back into the ground. However, as time goes on, these deposits make the ground less permeable, which means the plant has to keep digging new ponds in the surrounding lava field.

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