Why is Sky Lagoon warm?

As you swim and walk through the water, you'll feel pockets of temperature differences. Sky Lagoon is all naturally-heated through geothermal means. The water is piped in at a scaldingly-hot temperature and cooled before it goes into circulation in the Lagoon.



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Iceland's newest man-made lagoon, The Sky Lagoon opened in 2021. It is naturally heated by geothermal activity, just like the Blue Lagoon and even though it is man-made, there's an ancient feel to the grottos and curvy stone infinity pool that looks out over the steely Atlantic Ocean.

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Because they are shallow, lagoon waters approximate the air temperature: colder than the open ocean in winter, warmer in summer. Salinities decrease as a function of the amount of runoff entering the lagoon in relation to the tidal influx.

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How is the Blue Lagoon Heated? Geothermal energy. Underground lava flows and natural hot springs heat the lagoon's mix of sea and freshwater. The water is drawn up through geothermal extraction wells from 2-kilometres beneath the Earth's surface.

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Unlike boring old regular geothermal water, the composition of the Blue Lagoon is unique—you won't find it anywhere else in the world. It's home to a couple of algae plants also not known to exist elsewhere. This combination has been found to have a number of proven beneficial effects on skin.

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The fact of the matter is that Blue Lagoon's water does in many cases make your hair quite weird. The minerals in the water will coat each and every hair making it stiff and feel dry even though it isn't really.

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The Blue Lagoon was named because the water of the lagoon looks blue when reflected from the sun but in actuality, the water is a milky white color. And don't worry about the smell, the sulfur has been removed so there is no funky smell at all anymore.

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