How is Secret Lagoon heated?

The location of the Secret Lagoon is in a huge and very active hot spring area. That means the pool is fed by hot water from natural hot springs nearby. It consists of very clear ground water. So if you go there, you will see what most Icelanders think of when you say 'hot spring'.



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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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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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While Iceland is a country brimming with natural hot springs, the Blue Lagoon actually isn't one of them. The land is natural, as is the lava that shapes the pool, but the hot water is actually the result of runoff from the geothermal power plant next door.

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The water's iconic color is a result of the way that silica reflects sunlight. Deep in the earth, the water's temperature is a scorching 240° C. By the time the water reaches the lagoon, it is a warm, luxurious 38° C. Geothermal seawater is 70% ocean water and 30% freshwater.

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Additionally, there are quite a few natural hot springs people can bathe in such as Landmannalaugar, The Secret Lagoon and Kerlingafjöll. The downside is the smell.

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The Secret Lagoon entrance package is generous, as you can stay there as long as you want. However, most visitors stay there 1 to 2 hours. The pool is popular for good reason, it would be a real shame to go to the Golden Circle region without stopping there.

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The water in the Blue Lagoon is a super comfortable, warm temperature that you will definitely stay comfortable in. However, because of the cold air temperature, any part of your body that isn't underwater will get chilly at points.

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In fact, you can always touch the bottom of the lagoon standing up, so it is not like a swimming pool. The milky-blue depths aren't clear either, so you only really want to stick your head under the water to keep warm or perhaps wash off your mud mask.

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Compared to the Blue Lagoon, Sky Lagoon or Laugarvatn Fontana, the Secret Lagoon is probably the best in terms of price. The pros that this lagoon offers are that it is located in an ideal location, especially for those who want to relax after a trip in the Golden Circle and end the day with a swim.

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All guests must shower—without a swimsuit—before entering the Blue Lagoon. Use of Blue Lagoon skin care shower gel and hair conditioner is complimentary. If you desire more privacy while you shower, locate a shower that is equipped with a door.

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If you book the Premium or Luxury packages, then your entrance also includes a bathrobe. If you have your own towel (or bathrobe), you are welcome to bring it to the Blue Lagoon to use. However, we recommend just using the free towel provided as otherwise you will have wet towels to take home with you.

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You're sure to want to take some photos in the otherworldly surroundings of the Blue Lagoon, so you'll be pleased to hear that phones are allowed. However, there are no designated places to put your phone when you're not using it, so you take it in at your own risk.

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But is the lagoon's renowned geothermal seawater harmful to your hair? No, it is not harmful. Geothermal seawater contains high concentrations of minerals, such as sulfur, silica, and magnesium. While these are great for your skin, they can leave your hair feeling dry and matted.

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